Bring back channel notes (#3506)

Max Brunsfeld created

Change summary

Cargo.lock                                       |    2 
crates/collab2/Cargo.toml                        |    2 
crates/collab2/src/tests/channel_buffer_tests.rs | 1756 +++++++++--------
crates/collab2/src/tests/test_server.rs          |   14 
crates/collab_ui2/src/channel_view.rs            |  898 ++++----
crates/collab_ui2/src/collab_panel.rs            |    7 
crates/collab_ui2/src/collab_ui.rs               |    1 
crates/gpui2/src/app/test_context.rs             |    4 
crates/workspace2/src/workspace2.rs              |   25 
9 files changed, 1,356 insertions(+), 1,353 deletions(-)

Detailed changes

Cargo.lock 🔗

@@ -1830,7 +1830,7 @@ dependencies = [
  "clap 3.2.25",
  "client2",
  "clock",
- "collab_ui",
+ "collab_ui2",
  "collections",
  "ctor",
  "dashmap",

crates/collab2/Cargo.toml 🔗

@@ -81,7 +81,7 @@ settings = { package = "settings2", path = "../settings2", features = ["test-sup
 theme = { package = "theme2", path = "../theme2" }
 workspace = { package = "workspace2", path = "../workspace2", features = ["test-support"] }
 
-collab_ui = { path = "../collab_ui", features = ["test-support"] }
+collab_ui = { path = "../collab_ui2", package = "collab_ui2", features = ["test-support"] }
 
 async-trait.workspace = true
 pretty_assertions.workspace = true

crates/collab2/src/tests/channel_buffer_tests.rs 🔗

@@ -1,875 +1,881 @@
-//todo(partially ported)
-// use std::ops::Range;
-
-// use crate::{
-//     rpc::{CLEANUP_TIMEOUT, RECONNECT_TIMEOUT},
-//     tests::TestServer,
-// };
-// use client::{Collaborator, ParticipantIndex, UserId};
-// use collections::HashMap;
-// use editor::{Anchor, Editor, ToOffset};
-// use futures::future;
-// use gpui::{BackgroundExecutor, Model, TestAppContext, ViewContext};
-// use rpc::{proto::PeerId, RECEIVE_TIMEOUT};
-
-// #[gpui::test]
-// async fn test_core_channel_buffers(
-//     executor: BackgroundExecutor,
-//     cx_a: &mut TestAppContext,
-//     cx_b: &mut TestAppContext,
-// ) {
-//     let mut server = TestServer::start(executor.clone()).await;
-//     let client_a = server.create_client(cx_a, "user_a").await;
-//     let client_b = server.create_client(cx_b, "user_b").await;
-
-//     let channel_id = server
-//         .make_channel("zed", None, (&client_a, cx_a), &mut [(&client_b, cx_b)])
-//         .await;
-
-//     // Client A joins the channel buffer
-//     let channel_buffer_a = client_a
-//         .channel_store()
-//         .update(cx_a, |store, cx| store.open_channel_buffer(channel_id, cx))
-//         .await
-//         .unwrap();
-
-//     // Client A edits the buffer
-//     let buffer_a = channel_buffer_a.read_with(cx_a, |buffer, _| buffer.buffer());
-//     buffer_a.update(cx_a, |buffer, cx| {
-//         buffer.edit([(0..0, "hello world")], None, cx)
-//     });
-//     buffer_a.update(cx_a, |buffer, cx| {
-//         buffer.edit([(5..5, ", cruel")], None, cx)
-//     });
-//     buffer_a.update(cx_a, |buffer, cx| {
-//         buffer.edit([(0..5, "goodbye")], None, cx)
-//     });
-//     buffer_a.update(cx_a, |buffer, cx| buffer.undo(cx));
-//     assert_eq!(buffer_text(&buffer_a, cx_a), "hello, cruel world");
-//     executor.run_until_parked();
-
-//     // Client B joins the channel buffer
-//     let channel_buffer_b = client_b
-//         .channel_store()
-//         .update(cx_b, |store, cx| store.open_channel_buffer(channel_id, cx))
-//         .await
-//         .unwrap();
-//     channel_buffer_b.read_with(cx_b, |buffer, _| {
-//         assert_collaborators(
-//             buffer.collaborators(),
-//             &[client_a.user_id(), client_b.user_id()],
-//         );
-//     });
-
-//     // Client B sees the correct text, and then edits it
-//     let buffer_b = channel_buffer_b.read_with(cx_b, |buffer, _| buffer.buffer());
-//     assert_eq!(
-//         buffer_b.read_with(cx_b, |buffer, _| buffer.remote_id()),
-//         buffer_a.read_with(cx_a, |buffer, _| buffer.remote_id())
-//     );
-//     assert_eq!(buffer_text(&buffer_b, cx_b), "hello, cruel world");
-//     buffer_b.update(cx_b, |buffer, cx| {
-//         buffer.edit([(7..12, "beautiful")], None, cx)
-//     });
-
-//     // Both A and B see the new edit
-//     executor.run_until_parked();
-//     assert_eq!(buffer_text(&buffer_a, cx_a), "hello, beautiful world");
-//     assert_eq!(buffer_text(&buffer_b, cx_b), "hello, beautiful world");
-
-//     // Client A closes the channel buffer.
-//     cx_a.update(|_| drop(channel_buffer_a));
-//     executor.run_until_parked();
-
-//     // Client B sees that client A is gone from the channel buffer.
-//     channel_buffer_b.read_with(cx_b, |buffer, _| {
-//         assert_collaborators(&buffer.collaborators(), &[client_b.user_id()]);
-//     });
-
-//     // Client A rejoins the channel buffer
-//     let _channel_buffer_a = client_a
-//         .channel_store()
-//         .update(cx_a, |store, cx| store.open_channel_buffer(channel_id, cx))
-//         .await
-//         .unwrap();
-//     executor.run_until_parked();
-
-//     // Sanity test, make sure we saw A rejoining
-//     channel_buffer_b.read_with(cx_b, |buffer, _| {
-//         assert_collaborators(
-//             &buffer.collaborators(),
-//             &[client_a.user_id(), client_b.user_id()],
-//         );
-//     });
-
-//     // Client A loses connection.
-//     server.forbid_connections();
-//     server.disconnect_client(client_a.peer_id().unwrap());
-//     executor.advance_clock(RECEIVE_TIMEOUT + RECONNECT_TIMEOUT);
-
-//     // Client B observes A disconnect
-//     channel_buffer_b.read_with(cx_b, |buffer, _| {
-//         assert_collaborators(&buffer.collaborators(), &[client_b.user_id()]);
-//     });
-
-//     // TODO:
-//     // - Test synchronizing offline updates, what happens to A's channel buffer when A disconnects
-//     // - Test interaction with channel deletion while buffer is open
-// }
-
-// // todo!("collab_ui")
-// // #[gpui::test]
-// // async fn test_channel_notes_participant_indices(
-// //     executor: BackgroundExecutor,
-// //     mut cx_a: &mut TestAppContext,
-// //     mut cx_b: &mut TestAppContext,
-// //     cx_c: &mut TestAppContext,
-// // ) {
-// //     let mut server = TestServer::start(&executor).await;
-// //     let client_a = server.create_client(cx_a, "user_a").await;
-// //     let client_b = server.create_client(cx_b, "user_b").await;
-// //     let client_c = server.create_client(cx_c, "user_c").await;
-
-// //     let active_call_a = cx_a.read(ActiveCall::global);
-// //     let active_call_b = cx_b.read(ActiveCall::global);
-
-// //     cx_a.update(editor::init);
-// //     cx_b.update(editor::init);
-// //     cx_c.update(editor::init);
-
-// //     let channel_id = server
-// //         .make_channel(
-// //             "the-channel",
-// //             None,
-// //             (&client_a, cx_a),
-// //             &mut [(&client_b, cx_b), (&client_c, cx_c)],
-// //         )
-// //         .await;
-
-// //     client_a
-// //         .fs()
-// //         .insert_tree("/root", json!({"file.txt": "123"}))
-// //         .await;
-// //     let (project_a, worktree_id_a) = client_a.build_local_project("/root", cx_a).await;
-// //     let project_b = client_b.build_empty_local_project(cx_b);
-// //     let project_c = client_c.build_empty_local_project(cx_c);
-// //     let workspace_a = client_a.build_workspace(&project_a, cx_a).root(cx_a);
-// //     let workspace_b = client_b.build_workspace(&project_b, cx_b).root(cx_b);
-// //     let workspace_c = client_c.build_workspace(&project_c, cx_c).root(cx_c);
-
-// //     // Clients A, B, and C open the channel notes
-// //     let channel_view_a = cx_a
-// //         .update(|cx| ChannelView::open(channel_id, workspace_a.clone(), cx))
-// //         .await
-// //         .unwrap();
-// //     let channel_view_b = cx_b
-// //         .update(|cx| ChannelView::open(channel_id, workspace_b.clone(), cx))
-// //         .await
-// //         .unwrap();
-// //     let channel_view_c = cx_c
-// //         .update(|cx| ChannelView::open(channel_id, workspace_c.clone(), cx))
-// //         .await
-// //         .unwrap();
-
-// //     // Clients A, B, and C all insert and select some text
-// //     channel_view_a.update(cx_a, |notes, cx| {
-// //         notes.editor.update(cx, |editor, cx| {
-// //             editor.insert("a", cx);
-// //             editor.change_selections(None, cx, |selections| {
-// //                 selections.select_ranges(vec![0..1]);
-// //             });
-// //         });
-// //     });
-// //     executor.run_until_parked();
-// //     channel_view_b.update(cx_b, |notes, cx| {
-// //         notes.editor.update(cx, |editor, cx| {
-// //             editor.move_down(&Default::default(), cx);
-// //             editor.insert("b", cx);
-// //             editor.change_selections(None, cx, |selections| {
-// //                 selections.select_ranges(vec![1..2]);
-// //             });
-// //         });
-// //     });
-// //     executor.run_until_parked();
-// //     channel_view_c.update(cx_c, |notes, cx| {
-// //         notes.editor.update(cx, |editor, cx| {
-// //             editor.move_down(&Default::default(), cx);
-// //             editor.insert("c", cx);
-// //             editor.change_selections(None, cx, |selections| {
-// //                 selections.select_ranges(vec![2..3]);
-// //             });
-// //         });
-// //     });
-
-// //     // Client A sees clients B and C without assigned colors, because they aren't
-// //     // in a call together.
-// //     executor.run_until_parked();
-// //     channel_view_a.update(cx_a, |notes, cx| {
-// //         notes.editor.update(cx, |editor, cx| {
-// //             assert_remote_selections(editor, &[(None, 1..2), (None, 2..3)], cx);
-// //         });
-// //     });
-
-// //     // Clients A and B join the same call.
-// //     for (call, cx) in [(&active_call_a, &mut cx_a), (&active_call_b, &mut cx_b)] {
-// //         call.update(*cx, |call, cx| call.join_channel(channel_id, cx))
-// //             .await
-// //             .unwrap();
-// //     }
-
-// //     // Clients A and B see each other with two different assigned colors. Client C
-// //     // still doesn't have a color.
-// //     executor.run_until_parked();
-// //     channel_view_a.update(cx_a, |notes, cx| {
-// //         notes.editor.update(cx, |editor, cx| {
-// //             assert_remote_selections(
-// //                 editor,
-// //                 &[(Some(ParticipantIndex(1)), 1..2), (None, 2..3)],
-// //                 cx,
-// //             );
-// //         });
-// //     });
-// //     channel_view_b.update(cx_b, |notes, cx| {
-// //         notes.editor.update(cx, |editor, cx| {
-// //             assert_remote_selections(
-// //                 editor,
-// //                 &[(Some(ParticipantIndex(0)), 0..1), (None, 2..3)],
-// //                 cx,
-// //             );
-// //         });
-// //     });
-
-// //     // Client A shares a project, and client B joins.
-// //     let project_id = active_call_a
-// //         .update(cx_a, |call, cx| call.share_project(project_a.clone(), cx))
-// //         .await
-// //         .unwrap();
-// //     let project_b = client_b.build_remote_project(project_id, cx_b).await;
-// //     let workspace_b = client_b.build_workspace(&project_b, cx_b).root(cx_b);
-
-// //     // Clients A and B open the same file.
-// //     let editor_a = workspace_a
-// //         .update(cx_a, |workspace, cx| {
-// //             workspace.open_path((worktree_id_a, "file.txt"), None, true, cx)
-// //         })
-// //         .await
-// //         .unwrap()
-// //         .downcast::<Editor>()
-// //         .unwrap();
-// //     let editor_b = workspace_b
-// //         .update(cx_b, |workspace, cx| {
-// //             workspace.open_path((worktree_id_a, "file.txt"), None, true, cx)
-// //         })
-// //         .await
-// //         .unwrap()
-// //         .downcast::<Editor>()
-// //         .unwrap();
-
-// //     editor_a.update(cx_a, |editor, cx| {
-// //         editor.change_selections(None, cx, |selections| {
-// //             selections.select_ranges(vec![0..1]);
-// //         });
-// //     });
-// //     editor_b.update(cx_b, |editor, cx| {
-// //         editor.change_selections(None, cx, |selections| {
-// //             selections.select_ranges(vec![2..3]);
-// //         });
-// //     });
-// //     executor.run_until_parked();
-
-// //     // Clients A and B see each other with the same colors as in the channel notes.
-// //     editor_a.update(cx_a, |editor, cx| {
-// //         assert_remote_selections(editor, &[(Some(ParticipantIndex(1)), 2..3)], cx);
-// //     });
-// //     editor_b.update(cx_b, |editor, cx| {
-// //         assert_remote_selections(editor, &[(Some(ParticipantIndex(0)), 0..1)], cx);
-// //     });
-// // }
-
-// #[track_caller]
-// fn assert_remote_selections(
-//     editor: &mut Editor,
-//     expected_selections: &[(Option<ParticipantIndex>, Range<usize>)],
-//     cx: &mut ViewContext<Editor>,
-// ) {
-//     let snapshot = editor.snapshot(cx);
-//     let range = Anchor::min()..Anchor::max();
-//     let remote_selections = snapshot
-//         .remote_selections_in_range(&range, editor.collaboration_hub().unwrap(), cx)
-//         .map(|s| {
-//             let start = s.selection.start.to_offset(&snapshot.buffer_snapshot);
-//             let end = s.selection.end.to_offset(&snapshot.buffer_snapshot);
-//             (s.participant_index, start..end)
-//         })
-//         .collect::<Vec<_>>();
-//     assert_eq!(
-//         remote_selections, expected_selections,
-//         "incorrect remote selections"
-//     );
-// }
-
-// #[gpui::test]
-// async fn test_multiple_handles_to_channel_buffer(
-//     deterministic: BackgroundExecutor,
-//     cx_a: &mut TestAppContext,
-// ) {
-//     let mut server = TestServer::start(deterministic.clone()).await;
-//     let client_a = server.create_client(cx_a, "user_a").await;
-
-//     let channel_id = server
-//         .make_channel("the-channel", None, (&client_a, cx_a), &mut [])
-//         .await;
-
-//     let channel_buffer_1 = client_a
-//         .channel_store()
-//         .update(cx_a, |store, cx| store.open_channel_buffer(channel_id, cx));
-//     let channel_buffer_2 = client_a
-//         .channel_store()
-//         .update(cx_a, |store, cx| store.open_channel_buffer(channel_id, cx));
-//     let channel_buffer_3 = client_a
-//         .channel_store()
-//         .update(cx_a, |store, cx| store.open_channel_buffer(channel_id, cx));
-
-//     // All concurrent tasks for opening a channel buffer return the same model handle.
-//     let (channel_buffer, channel_buffer_2, channel_buffer_3) =
-//         future::try_join3(channel_buffer_1, channel_buffer_2, channel_buffer_3)
-//             .await
-//             .unwrap();
-//     let channel_buffer_model_id = channel_buffer.entity_id();
-//     assert_eq!(channel_buffer, channel_buffer_2);
-//     assert_eq!(channel_buffer, channel_buffer_3);
-
-//     channel_buffer.update(cx_a, |buffer, cx| {
-//         buffer.buffer().update(cx, |buffer, cx| {
-//             buffer.edit([(0..0, "hello")], None, cx);
-//         })
-//     });
-//     deterministic.run_until_parked();
-
-//     cx_a.update(|_| {
-//         drop(channel_buffer);
-//         drop(channel_buffer_2);
-//         drop(channel_buffer_3);
-//     });
-//     deterministic.run_until_parked();
-
-//     // The channel buffer can be reopened after dropping it.
-//     let channel_buffer = client_a
-//         .channel_store()
-//         .update(cx_a, |store, cx| store.open_channel_buffer(channel_id, cx))
-//         .await
-//         .unwrap();
-//     assert_ne!(channel_buffer.entity_id(), channel_buffer_model_id);
-//     channel_buffer.update(cx_a, |buffer, cx| {
-//         buffer.buffer().update(cx, |buffer, _| {
-//             assert_eq!(buffer.text(), "hello");
-//         })
-//     });
-// }
-
-// #[gpui::test]
-// async fn test_channel_buffer_disconnect(
-//     deterministic: BackgroundExecutor,
-//     cx_a: &mut TestAppContext,
-//     cx_b: &mut TestAppContext,
-// ) {
-//     let mut server = TestServer::start(deterministic.clone()).await;
-//     let client_a = server.create_client(cx_a, "user_a").await;
-//     let client_b = server.create_client(cx_b, "user_b").await;
-
-//     let channel_id = server
-//         .make_channel(
-//             "the-channel",
-//             None,
-//             (&client_a, cx_a),
-//             &mut [(&client_b, cx_b)],
-//         )
-//         .await;
-
-//     let channel_buffer_a = client_a
-//         .channel_store()
-//         .update(cx_a, |store, cx| store.open_channel_buffer(channel_id, cx))
-//         .await
-//         .unwrap();
-
-//     let channel_buffer_b = client_b
-//         .channel_store()
-//         .update(cx_b, |store, cx| store.open_channel_buffer(channel_id, cx))
-//         .await
-//         .unwrap();
-
-//     server.forbid_connections();
-//     server.disconnect_client(client_a.peer_id().unwrap());
-//     deterministic.advance_clock(RECEIVE_TIMEOUT + RECONNECT_TIMEOUT);
-
-//     channel_buffer_a.update(cx_a, |buffer, cx| {
-//         assert_eq!(buffer.channel(cx).unwrap().name, "the-channel");
-//         assert!(!buffer.is_connected());
-//     });
-
-//     deterministic.run_until_parked();
-
-//     server.allow_connections();
-//     deterministic.advance_clock(RECEIVE_TIMEOUT + RECONNECT_TIMEOUT);
-
-//     deterministic.run_until_parked();
-
-//     client_a
-//         .channel_store()
-//         .update(cx_a, |channel_store, _| {
-//             channel_store.remove_channel(channel_id)
-//         })
-//         .await
-//         .unwrap();
-//     deterministic.run_until_parked();
-
-//     // Channel buffer observed the deletion
-//     channel_buffer_b.update(cx_b, |buffer, cx| {
-//         assert!(buffer.channel(cx).is_none());
-//         assert!(!buffer.is_connected());
-//     });
-// }
-
-// #[gpui::test]
-// async fn test_rejoin_channel_buffer(
-//     deterministic: BackgroundExecutor,
-//     cx_a: &mut TestAppContext,
-//     cx_b: &mut TestAppContext,
-// ) {
-//     let mut server = TestServer::start(deterministic.clone()).await;
-//     let client_a = server.create_client(cx_a, "user_a").await;
-//     let client_b = server.create_client(cx_b, "user_b").await;
-
-//     let channel_id = server
-//         .make_channel(
-//             "the-channel",
-//             None,
-//             (&client_a, cx_a),
-//             &mut [(&client_b, cx_b)],
-//         )
-//         .await;
-
-//     let channel_buffer_a = client_a
-//         .channel_store()
-//         .update(cx_a, |store, cx| store.open_channel_buffer(channel_id, cx))
-//         .await
-//         .unwrap();
-//     let channel_buffer_b = client_b
-//         .channel_store()
-//         .update(cx_b, |store, cx| store.open_channel_buffer(channel_id, cx))
-//         .await
-//         .unwrap();
-
-//     channel_buffer_a.update(cx_a, |buffer, cx| {
-//         buffer.buffer().update(cx, |buffer, cx| {
-//             buffer.edit([(0..0, "1")], None, cx);
-//         })
-//     });
-//     deterministic.run_until_parked();
-
-//     // Client A disconnects.
-//     server.forbid_connections();
-//     server.disconnect_client(client_a.peer_id().unwrap());
-
-//     // Both clients make an edit.
-//     channel_buffer_a.update(cx_a, |buffer, cx| {
-//         buffer.buffer().update(cx, |buffer, cx| {
-//             buffer.edit([(1..1, "2")], None, cx);
-//         })
-//     });
-//     channel_buffer_b.update(cx_b, |buffer, cx| {
-//         buffer.buffer().update(cx, |buffer, cx| {
-//             buffer.edit([(0..0, "0")], None, cx);
-//         })
-//     });
-
-//     // Both clients see their own edit.
-//     deterministic.run_until_parked();
-//     channel_buffer_a.read_with(cx_a, |buffer, cx| {
-//         assert_eq!(buffer.buffer().read(cx).text(), "12");
-//     });
-//     channel_buffer_b.read_with(cx_b, |buffer, cx| {
-//         assert_eq!(buffer.buffer().read(cx).text(), "01");
-//     });
-
-//     // Client A reconnects. Both clients see each other's edits, and see
-//     // the same collaborators.
-//     server.allow_connections();
-//     deterministic.advance_clock(RECEIVE_TIMEOUT);
-//     channel_buffer_a.read_with(cx_a, |buffer, cx| {
-//         assert_eq!(buffer.buffer().read(cx).text(), "012");
-//     });
-//     channel_buffer_b.read_with(cx_b, |buffer, cx| {
-//         assert_eq!(buffer.buffer().read(cx).text(), "012");
-//     });
-
-//     channel_buffer_a.read_with(cx_a, |buffer_a, _| {
-//         channel_buffer_b.read_with(cx_b, |buffer_b, _| {
-//             assert_eq!(buffer_a.collaborators(), buffer_b.collaborators());
-//         });
-//     });
-// }
-
-// #[gpui::test]
-// async fn test_channel_buffers_and_server_restarts(
-//     deterministic: BackgroundExecutor,
-//     cx_a: &mut TestAppContext,
-//     cx_b: &mut TestAppContext,
-//     cx_c: &mut TestAppContext,
-// ) {
-//     let mut server = TestServer::start(deterministic.clone()).await;
-//     let client_a = server.create_client(cx_a, "user_a").await;
-//     let client_b = server.create_client(cx_b, "user_b").await;
-//     let client_c = server.create_client(cx_c, "user_c").await;
-
-//     let channel_id = server
-//         .make_channel(
-//             "the-channel",
-//             None,
-//             (&client_a, cx_a),
-//             &mut [(&client_b, cx_b), (&client_c, cx_c)],
-//         )
-//         .await;
-
-//     let channel_buffer_a = client_a
-//         .channel_store()
-//         .update(cx_a, |store, cx| store.open_channel_buffer(channel_id, cx))
-//         .await
-//         .unwrap();
-//     let channel_buffer_b = client_b
-//         .channel_store()
-//         .update(cx_b, |store, cx| store.open_channel_buffer(channel_id, cx))
-//         .await
-//         .unwrap();
-//     let _channel_buffer_c = client_c
-//         .channel_store()
-//         .update(cx_c, |store, cx| store.open_channel_buffer(channel_id, cx))
-//         .await
-//         .unwrap();
-
-//     channel_buffer_a.update(cx_a, |buffer, cx| {
-//         buffer.buffer().update(cx, |buffer, cx| {
-//             buffer.edit([(0..0, "1")], None, cx);
-//         })
-//     });
-//     deterministic.run_until_parked();
-
-//     // Client C can't reconnect.
-//     client_c.override_establish_connection(|_, cx| cx.spawn(|_| future::pending()));
-
-//     // Server stops.
-//     server.reset().await;
-//     deterministic.advance_clock(RECEIVE_TIMEOUT);
-
-//     // While the server is down, both clients make an edit.
-//     channel_buffer_a.update(cx_a, |buffer, cx| {
-//         buffer.buffer().update(cx, |buffer, cx| {
-//             buffer.edit([(1..1, "2")], None, cx);
-//         })
-//     });
-//     channel_buffer_b.update(cx_b, |buffer, cx| {
-//         buffer.buffer().update(cx, |buffer, cx| {
-//             buffer.edit([(0..0, "0")], None, cx);
-//         })
-//     });
-
-//     // Server restarts.
-//     server.start().await.unwrap();
-//     deterministic.advance_clock(CLEANUP_TIMEOUT);
-
-//     // Clients reconnects. Clients A and B see each other's edits, and see
-//     // that client C has disconnected.
-//     channel_buffer_a.read_with(cx_a, |buffer, cx| {
-//         assert_eq!(buffer.buffer().read(cx).text(), "012");
-//     });
-//     channel_buffer_b.read_with(cx_b, |buffer, cx| {
-//         assert_eq!(buffer.buffer().read(cx).text(), "012");
-//     });
-
-//     channel_buffer_a.read_with(cx_a, |buffer_a, _| {
-//         channel_buffer_b.read_with(cx_b, |buffer_b, _| {
-//             assert_collaborators(
-//                 buffer_a.collaborators(),
-//                 &[client_a.user_id(), client_b.user_id()],
-//             );
-//             assert_eq!(buffer_a.collaborators(), buffer_b.collaborators());
-//         });
-//     });
-// }
-
-// //todo!(collab_ui)
-// // #[gpui::test(iterations = 10)]
-// // async fn test_following_to_channel_notes_without_a_shared_project(
-// //     deterministic: BackgroundExecutor,
-// //     mut cx_a: &mut TestAppContext,
-// //     mut cx_b: &mut TestAppContext,
-// //     mut cx_c: &mut TestAppContext,
-// // ) {
-// //     let mut server = TestServer::start(&deterministic).await;
-// //     let client_a = server.create_client(cx_a, "user_a").await;
-// //     let client_b = server.create_client(cx_b, "user_b").await;
-
-// //     let client_c = server.create_client(cx_c, "user_c").await;
-
-// //     cx_a.update(editor::init);
-// //     cx_b.update(editor::init);
-// //     cx_c.update(editor::init);
-// //     cx_a.update(collab_ui::channel_view::init);
-// //     cx_b.update(collab_ui::channel_view::init);
-// //     cx_c.update(collab_ui::channel_view::init);
-
-// //     let channel_1_id = server
-// //         .make_channel(
-// //             "channel-1",
-// //             None,
-// //             (&client_a, cx_a),
-// //             &mut [(&client_b, cx_b), (&client_c, cx_c)],
-// //         )
-// //         .await;
-// //     let channel_2_id = server
-// //         .make_channel(
-// //             "channel-2",
-// //             None,
-// //             (&client_a, cx_a),
-// //             &mut [(&client_b, cx_b), (&client_c, cx_c)],
-// //         )
-// //         .await;
-
-// //     // Clients A, B, and C join a channel.
-// //     let active_call_a = cx_a.read(ActiveCall::global);
-// //     let active_call_b = cx_b.read(ActiveCall::global);
-// //     let active_call_c = cx_c.read(ActiveCall::global);
-// //     for (call, cx) in [
-// //         (&active_call_a, &mut cx_a),
-// //         (&active_call_b, &mut cx_b),
-// //         (&active_call_c, &mut cx_c),
-// //     ] {
-// //         call.update(*cx, |call, cx| call.join_channel(channel_1_id, cx))
-// //             .await
-// //             .unwrap();
-// //     }
-// //     deterministic.run_until_parked();
-
-// //     // Clients A, B, and C all open their own unshared projects.
-// //     client_a.fs().insert_tree("/a", json!({})).await;
-// //     client_b.fs().insert_tree("/b", json!({})).await;
-// //     client_c.fs().insert_tree("/c", json!({})).await;
-// //     let (project_a, _) = client_a.build_local_project("/a", cx_a).await;
-// //     let (project_b, _) = client_b.build_local_project("/b", cx_b).await;
-// //     let (project_c, _) = client_b.build_local_project("/c", cx_c).await;
-// //     let workspace_a = client_a.build_workspace(&project_a, cx_a).root(cx_a);
-// //     let workspace_b = client_b.build_workspace(&project_b, cx_b).root(cx_b);
-// //     let _workspace_c = client_c.build_workspace(&project_c, cx_c).root(cx_c);
-
-// //     active_call_a
-// //         .update(cx_a, |call, cx| call.set_location(Some(&project_a), cx))
-// //         .await
-// //         .unwrap();
-
-// //     // Client A opens the notes for channel 1.
-// //     let channel_view_1_a = cx_a
-// //         .update(|cx| ChannelView::open(channel_1_id, workspace_a.clone(), cx))
-// //         .await
-// //         .unwrap();
-// //     channel_view_1_a.update(cx_a, |notes, cx| {
-// //         assert_eq!(notes.channel(cx).unwrap().name, "channel-1");
-// //         notes.editor.update(cx, |editor, cx| {
-// //             editor.insert("Hello from A.", cx);
-// //             editor.change_selections(None, cx, |selections| {
-// //                 selections.select_ranges(vec![3..4]);
-// //             });
-// //         });
-// //     });
-
-// //     // Client B follows client A.
-// //     workspace_b
-// //         .update(cx_b, |workspace, cx| {
-// //             workspace.follow(client_a.peer_id().unwrap(), cx).unwrap()
-// //         })
-// //         .await
-// //         .unwrap();
-
-// //     // Client B is taken to the notes for channel 1, with the same
-// //     // text selected as client A.
-// //     deterministic.run_until_parked();
-// //     let channel_view_1_b = workspace_b.read_with(cx_b, |workspace, cx| {
-// //         assert_eq!(
-// //             workspace.leader_for_pane(workspace.active_pane()),
-// //             Some(client_a.peer_id().unwrap())
-// //         );
-// //         workspace
-// //             .active_item(cx)
-// //             .expect("no active item")
-// //             .downcast::<ChannelView>()
-// //             .expect("active item is not a channel view")
-// //     });
-// //     channel_view_1_b.read_with(cx_b, |notes, cx| {
-// //         assert_eq!(notes.channel(cx).unwrap().name, "channel-1");
-// //         let editor = notes.editor.read(cx);
-// //         assert_eq!(editor.text(cx), "Hello from A.");
-// //         assert_eq!(editor.selections.ranges::<usize>(cx), &[3..4]);
-// //     });
-
-// //     // Client A opens the notes for channel 2.
-// //     let channel_view_2_a = cx_a
-// //         .update(|cx| ChannelView::open(channel_2_id, workspace_a.clone(), cx))
-// //         .await
-// //         .unwrap();
-// //     channel_view_2_a.read_with(cx_a, |notes, cx| {
-// //         assert_eq!(notes.channel(cx).unwrap().name, "channel-2");
-// //     });
-
-// //     // Client B is taken to the notes for channel 2.
-// //     deterministic.run_until_parked();
-// //     let channel_view_2_b = workspace_b.read_with(cx_b, |workspace, cx| {
-// //         assert_eq!(
-// //             workspace.leader_for_pane(workspace.active_pane()),
-// //             Some(client_a.peer_id().unwrap())
-// //         );
-// //         workspace
-// //             .active_item(cx)
-// //             .expect("no active item")
-// //             .downcast::<ChannelView>()
-// //             .expect("active item is not a channel view")
-// //     });
-// //     channel_view_2_b.read_with(cx_b, |notes, cx| {
-// //         assert_eq!(notes.channel(cx).unwrap().name, "channel-2");
-// //     });
-// // }
-
-// //todo!(collab_ui)
-// // #[gpui::test]
-// // async fn test_channel_buffer_changes(
-// //     deterministic: BackgroundExecutor,
-// //     cx_a: &mut TestAppContext,
-// //     cx_b: &mut TestAppContext,
-// // ) {
-// //     let mut server = TestServer::start(&deterministic).await;
-// //     let client_a = server.create_client(cx_a, "user_a").await;
-// //     let client_b = server.create_client(cx_b, "user_b").await;
-
-// //     let channel_id = server
-// //         .make_channel(
-// //             "the-channel",
-// //             None,
-// //             (&client_a, cx_a),
-// //             &mut [(&client_b, cx_b)],
-// //         )
-// //         .await;
-
-// //     let channel_buffer_a = client_a
-// //         .channel_store()
-// //         .update(cx_a, |store, cx| store.open_channel_buffer(channel_id, cx))
-// //         .await
-// //         .unwrap();
-
-// //     // Client A makes an edit, and client B should see that the note has changed.
-// //     channel_buffer_a.update(cx_a, |buffer, cx| {
-// //         buffer.buffer().update(cx, |buffer, cx| {
-// //             buffer.edit([(0..0, "1")], None, cx);
-// //         })
-// //     });
-// //     deterministic.run_until_parked();
-
-// //     let has_buffer_changed = cx_b.update(|cx| {
-// //         client_b
-// //             .channel_store()
-// //             .read(cx)
-// //             .has_channel_buffer_changed(channel_id)
-// //             .unwrap()
-// //     });
-// //     assert!(has_buffer_changed);
-
-// //     // Opening the buffer should clear the changed flag.
-// //     let project_b = client_b.build_empty_local_project(cx_b);
-// //     let workspace_b = client_b.build_workspace(&project_b, cx_b).root(cx_b);
-// //     let channel_view_b = cx_b
-// //         .update(|cx| ChannelView::open(channel_id, workspace_b.clone(), cx))
-// //         .await
-// //         .unwrap();
-// //     deterministic.run_until_parked();
-
-// //     let has_buffer_changed = cx_b.update(|cx| {
-// //         client_b
-// //             .channel_store()
-// //             .read(cx)
-// //             .has_channel_buffer_changed(channel_id)
-// //             .unwrap()
-// //     });
-// //     assert!(!has_buffer_changed);
-
-// //     // Editing the channel while the buffer is open should not show that the buffer has changed.
-// //     channel_buffer_a.update(cx_a, |buffer, cx| {
-// //         buffer.buffer().update(cx, |buffer, cx| {
-// //             buffer.edit([(0..0, "2")], None, cx);
-// //         })
-// //     });
-// //     deterministic.run_until_parked();
-
-// //     let has_buffer_changed = cx_b.read(|cx| {
-// //         client_b
-// //             .channel_store()
-// //             .read(cx)
-// //             .has_channel_buffer_changed(channel_id)
-// //             .unwrap()
-// //     });
-// //     assert!(!has_buffer_changed);
-
-// //     deterministic.advance_clock(ACKNOWLEDGE_DEBOUNCE_INTERVAL);
-
-// //     // Test that the server is tracking things correctly, and we retain our 'not changed'
-// //     // state across a disconnect
-// //     server.simulate_long_connection_interruption(client_b.peer_id().unwrap(), &deterministic);
-// //     let has_buffer_changed = cx_b.read(|cx| {
-// //         client_b
-// //             .channel_store()
-// //             .read(cx)
-// //             .has_channel_buffer_changed(channel_id)
-// //             .unwrap()
-// //     });
-// //     assert!(!has_buffer_changed);
-
-// //     // Closing the buffer should re-enable change tracking
-// //     cx_b.update(|cx| {
-// //         workspace_b.update(cx, |workspace, cx| {
-// //             workspace.close_all_items_and_panes(&Default::default(), cx)
-// //         });
-
-// //         drop(channel_view_b)
-// //     });
-
-// //     deterministic.run_until_parked();
-
-// //     channel_buffer_a.update(cx_a, |buffer, cx| {
-// //         buffer.buffer().update(cx, |buffer, cx| {
-// //             buffer.edit([(0..0, "3")], None, cx);
-// //         })
-// //     });
-// //     deterministic.run_until_parked();
-
-// //     let has_buffer_changed = cx_b.read(|cx| {
-// //         client_b
-// //             .channel_store()
-// //             .read(cx)
-// //             .has_channel_buffer_changed(channel_id)
-// //             .unwrap()
-// //     });
-// //     assert!(has_buffer_changed);
-// // }
-
-// #[track_caller]
-// fn assert_collaborators(collaborators: &HashMap<PeerId, Collaborator>, ids: &[Option<UserId>]) {
-//     let mut user_ids = collaborators
-//         .values()
-//         .map(|collaborator| collaborator.user_id)
-//         .collect::<Vec<_>>();
-//     user_ids.sort();
-//     assert_eq!(
-//         user_ids,
-//         ids.into_iter().map(|id| id.unwrap()).collect::<Vec<_>>()
-//     );
-// }
-
-// fn buffer_text(channel_buffer: &Model<language::Buffer>, cx: &mut TestAppContext) -> String {
-//     channel_buffer.read_with(cx, |buffer, _| buffer.text())
-// }
+use crate::{
+    rpc::{CLEANUP_TIMEOUT, RECONNECT_TIMEOUT},
+    tests::TestServer,
+};
+use call::ActiveCall;
+use channel::ACKNOWLEDGE_DEBOUNCE_INTERVAL;
+use client::{Collaborator, ParticipantIndex, UserId};
+use collab_ui::channel_view::ChannelView;
+use collections::HashMap;
+use editor::{Anchor, Editor, ToOffset};
+use futures::future;
+use gpui::{BackgroundExecutor, Model, TestAppContext, ViewContext};
+use rpc::{proto::PeerId, RECEIVE_TIMEOUT};
+use serde_json::json;
+use std::ops::Range;
+
+#[gpui::test]
+async fn test_core_channel_buffers(
+    executor: BackgroundExecutor,
+    cx_a: &mut TestAppContext,
+    cx_b: &mut TestAppContext,
+) {
+    let mut server = TestServer::start(executor.clone()).await;
+    let client_a = server.create_client(cx_a, "user_a").await;
+    let client_b = server.create_client(cx_b, "user_b").await;
+
+    let channel_id = server
+        .make_channel("zed", None, (&client_a, cx_a), &mut [(&client_b, cx_b)])
+        .await;
+
+    // Client A joins the channel buffer
+    let channel_buffer_a = client_a
+        .channel_store()
+        .update(cx_a, |store, cx| store.open_channel_buffer(channel_id, cx))
+        .await
+        .unwrap();
+
+    // Client A edits the buffer
+    let buffer_a = channel_buffer_a.read_with(cx_a, |buffer, _| buffer.buffer());
+    buffer_a.update(cx_a, |buffer, cx| {
+        buffer.edit([(0..0, "hello world")], None, cx)
+    });
+    buffer_a.update(cx_a, |buffer, cx| {
+        buffer.edit([(5..5, ", cruel")], None, cx)
+    });
+    buffer_a.update(cx_a, |buffer, cx| {
+        buffer.edit([(0..5, "goodbye")], None, cx)
+    });
+    buffer_a.update(cx_a, |buffer, cx| buffer.undo(cx));
+    assert_eq!(buffer_text(&buffer_a, cx_a), "hello, cruel world");
+    executor.run_until_parked();
+
+    // Client B joins the channel buffer
+    let channel_buffer_b = client_b
+        .channel_store()
+        .update(cx_b, |store, cx| store.open_channel_buffer(channel_id, cx))
+        .await
+        .unwrap();
+    channel_buffer_b.read_with(cx_b, |buffer, _| {
+        assert_collaborators(
+            buffer.collaborators(),
+            &[client_a.user_id(), client_b.user_id()],
+        );
+    });
+
+    // Client B sees the correct text, and then edits it
+    let buffer_b = channel_buffer_b.read_with(cx_b, |buffer, _| buffer.buffer());
+    assert_eq!(
+        buffer_b.read_with(cx_b, |buffer, _| buffer.remote_id()),
+        buffer_a.read_with(cx_a, |buffer, _| buffer.remote_id())
+    );
+    assert_eq!(buffer_text(&buffer_b, cx_b), "hello, cruel world");
+    buffer_b.update(cx_b, |buffer, cx| {
+        buffer.edit([(7..12, "beautiful")], None, cx)
+    });
+
+    // Both A and B see the new edit
+    executor.run_until_parked();
+    assert_eq!(buffer_text(&buffer_a, cx_a), "hello, beautiful world");
+    assert_eq!(buffer_text(&buffer_b, cx_b), "hello, beautiful world");
+
+    // Client A closes the channel buffer.
+    cx_a.update(|_| drop(channel_buffer_a));
+    executor.run_until_parked();
+
+    // Client B sees that client A is gone from the channel buffer.
+    channel_buffer_b.read_with(cx_b, |buffer, _| {
+        assert_collaborators(&buffer.collaborators(), &[client_b.user_id()]);
+    });
+
+    // Client A rejoins the channel buffer
+    let _channel_buffer_a = client_a
+        .channel_store()
+        .update(cx_a, |store, cx| store.open_channel_buffer(channel_id, cx))
+        .await
+        .unwrap();
+    executor.run_until_parked();
+
+    // Sanity test, make sure we saw A rejoining
+    channel_buffer_b.read_with(cx_b, |buffer, _| {
+        assert_collaborators(
+            &buffer.collaborators(),
+            &[client_a.user_id(), client_b.user_id()],
+        );
+    });
+
+    // Client A loses connection.
+    server.forbid_connections();
+    server.disconnect_client(client_a.peer_id().unwrap());
+    executor.advance_clock(RECEIVE_TIMEOUT + RECONNECT_TIMEOUT);
+
+    // Client B observes A disconnect
+    channel_buffer_b.read_with(cx_b, |buffer, _| {
+        assert_collaborators(&buffer.collaborators(), &[client_b.user_id()]);
+    });
+
+    // TODO:
+    // - Test synchronizing offline updates, what happens to A's channel buffer when A disconnects
+    // - Test interaction with channel deletion while buffer is open
+}
+
+#[gpui::test]
+async fn test_channel_notes_participant_indices(
+    executor: BackgroundExecutor,
+    cx_a: &mut TestAppContext,
+    cx_b: &mut TestAppContext,
+    cx_c: &mut TestAppContext,
+) {
+    let mut server = TestServer::start(executor.clone()).await;
+    let client_a = server.create_client(cx_a, "user_a").await;
+    let client_b = server.create_client(cx_b, "user_b").await;
+    let client_c = server.create_client(cx_c, "user_c").await;
+
+    let active_call_a = cx_a.read(ActiveCall::global);
+    let active_call_b = cx_b.read(ActiveCall::global);
+
+    cx_a.update(editor::init);
+    cx_b.update(editor::init);
+    cx_c.update(editor::init);
+
+    let channel_id = server
+        .make_channel(
+            "the-channel",
+            None,
+            (&client_a, cx_a),
+            &mut [(&client_b, cx_b), (&client_c, cx_c)],
+        )
+        .await;
+
+    client_a
+        .fs()
+        .insert_tree("/root", json!({"file.txt": "123"}))
+        .await;
+    let (project_a, worktree_id_a) = client_a.build_local_project("/root", cx_a).await;
+    let project_b = client_b.build_empty_local_project(cx_b);
+    let project_c = client_c.build_empty_local_project(cx_c);
+
+    let (workspace_a, mut cx_a) = client_a.build_workspace(&project_a, cx_a);
+    let (workspace_b, mut cx_b) = client_b.build_workspace(&project_b, cx_b);
+    let (workspace_c, cx_c) = client_c.build_workspace(&project_c, cx_c);
+
+    // Clients A, B, and C open the channel notes
+    let channel_view_a = cx_a
+        .update(|cx| ChannelView::open(channel_id, workspace_a.clone(), cx))
+        .await
+        .unwrap();
+    let channel_view_b = cx_b
+        .update(|cx| ChannelView::open(channel_id, workspace_b.clone(), cx))
+        .await
+        .unwrap();
+    let channel_view_c = cx_c
+        .update(|cx| ChannelView::open(channel_id, workspace_c.clone(), cx))
+        .await
+        .unwrap();
+
+    // Clients A, B, and C all insert and select some text
+    channel_view_a.update(cx_a, |notes, cx| {
+        notes.editor.update(cx, |editor, cx| {
+            editor.insert("a", cx);
+            editor.change_selections(None, cx, |selections| {
+                selections.select_ranges(vec![0..1]);
+            });
+        });
+    });
+    executor.run_until_parked();
+    channel_view_b.update(cx_b, |notes, cx| {
+        notes.editor.update(cx, |editor, cx| {
+            editor.move_down(&Default::default(), cx);
+            editor.insert("b", cx);
+            editor.change_selections(None, cx, |selections| {
+                selections.select_ranges(vec![1..2]);
+            });
+        });
+    });
+    executor.run_until_parked();
+    channel_view_c.update(cx_c, |notes, cx| {
+        notes.editor.update(cx, |editor, cx| {
+            editor.move_down(&Default::default(), cx);
+            editor.insert("c", cx);
+            editor.change_selections(None, cx, |selections| {
+                selections.select_ranges(vec![2..3]);
+            });
+        });
+    });
+
+    // Client A sees clients B and C without assigned colors, because they aren't
+    // in a call together.
+    executor.run_until_parked();
+    channel_view_a.update(cx_a, |notes, cx| {
+        notes.editor.update(cx, |editor, cx| {
+            assert_remote_selections(editor, &[(None, 1..2), (None, 2..3)], cx);
+        });
+    });
+
+    // Clients A and B join the same call.
+    for (call, cx) in [(&active_call_a, &mut cx_a), (&active_call_b, &mut cx_b)] {
+        call.update(*cx, |call, cx| call.join_channel(channel_id, cx))
+            .await
+            .unwrap();
+    }
+
+    // Clients A and B see each other with two different assigned colors. Client C
+    // still doesn't have a color.
+    executor.run_until_parked();
+    channel_view_a.update(cx_a, |notes, cx| {
+        notes.editor.update(cx, |editor, cx| {
+            assert_remote_selections(
+                editor,
+                &[(Some(ParticipantIndex(1)), 1..2), (None, 2..3)],
+                cx,
+            );
+        });
+    });
+    channel_view_b.update(cx_b, |notes, cx| {
+        notes.editor.update(cx, |editor, cx| {
+            assert_remote_selections(
+                editor,
+                &[(Some(ParticipantIndex(0)), 0..1), (None, 2..3)],
+                cx,
+            );
+        });
+    });
+
+    // Client A shares a project, and client B joins.
+    let project_id = active_call_a
+        .update(cx_a, |call, cx| call.share_project(project_a.clone(), cx))
+        .await
+        .unwrap();
+    let project_b = client_b.build_remote_project(project_id, cx_b).await;
+    let (workspace_b, cx_b) = client_b.build_workspace(&project_b, cx_b);
+
+    // Clients A and B open the same file.
+    let editor_a = workspace_a
+        .update(cx_a, |workspace, cx| {
+            workspace.open_path((worktree_id_a, "file.txt"), None, true, cx)
+        })
+        .await
+        .unwrap()
+        .downcast::<Editor>()
+        .unwrap();
+    let editor_b = workspace_b
+        .update(cx_b, |workspace, cx| {
+            workspace.open_path((worktree_id_a, "file.txt"), None, true, cx)
+        })
+        .await
+        .unwrap()
+        .downcast::<Editor>()
+        .unwrap();
+
+    editor_a.update(cx_a, |editor, cx| {
+        editor.change_selections(None, cx, |selections| {
+            selections.select_ranges(vec![0..1]);
+        });
+    });
+    editor_b.update(cx_b, |editor, cx| {
+        editor.change_selections(None, cx, |selections| {
+            selections.select_ranges(vec![2..3]);
+        });
+    });
+    executor.run_until_parked();
+
+    // Clients A and B see each other with the same colors as in the channel notes.
+    editor_a.update(cx_a, |editor, cx| {
+        assert_remote_selections(editor, &[(Some(ParticipantIndex(1)), 2..3)], cx);
+    });
+    editor_b.update(cx_b, |editor, cx| {
+        assert_remote_selections(editor, &[(Some(ParticipantIndex(0)), 0..1)], cx);
+    });
+}
+
+#[track_caller]
+fn assert_remote_selections(
+    editor: &mut Editor,
+    expected_selections: &[(Option<ParticipantIndex>, Range<usize>)],
+    cx: &mut ViewContext<Editor>,
+) {
+    let snapshot = editor.snapshot(cx);
+    let range = Anchor::min()..Anchor::max();
+    let remote_selections = snapshot
+        .remote_selections_in_range(&range, editor.collaboration_hub().unwrap(), cx)
+        .map(|s| {
+            let start = s.selection.start.to_offset(&snapshot.buffer_snapshot);
+            let end = s.selection.end.to_offset(&snapshot.buffer_snapshot);
+            (s.participant_index, start..end)
+        })
+        .collect::<Vec<_>>();
+    assert_eq!(
+        remote_selections, expected_selections,
+        "incorrect remote selections"
+    );
+}
+
+#[gpui::test]
+async fn test_multiple_handles_to_channel_buffer(
+    deterministic: BackgroundExecutor,
+    cx_a: &mut TestAppContext,
+) {
+    let mut server = TestServer::start(deterministic.clone()).await;
+    let client_a = server.create_client(cx_a, "user_a").await;
+
+    let channel_id = server
+        .make_channel("the-channel", None, (&client_a, cx_a), &mut [])
+        .await;
+
+    let channel_buffer_1 = client_a
+        .channel_store()
+        .update(cx_a, |store, cx| store.open_channel_buffer(channel_id, cx));
+    let channel_buffer_2 = client_a
+        .channel_store()
+        .update(cx_a, |store, cx| store.open_channel_buffer(channel_id, cx));
+    let channel_buffer_3 = client_a
+        .channel_store()
+        .update(cx_a, |store, cx| store.open_channel_buffer(channel_id, cx));
+
+    // All concurrent tasks for opening a channel buffer return the same model handle.
+    let (channel_buffer, channel_buffer_2, channel_buffer_3) =
+        future::try_join3(channel_buffer_1, channel_buffer_2, channel_buffer_3)
+            .await
+            .unwrap();
+    let channel_buffer_model_id = channel_buffer.entity_id();
+    assert_eq!(channel_buffer, channel_buffer_2);
+    assert_eq!(channel_buffer, channel_buffer_3);
+
+    channel_buffer.update(cx_a, |buffer, cx| {
+        buffer.buffer().update(cx, |buffer, cx| {
+            buffer.edit([(0..0, "hello")], None, cx);
+        })
+    });
+    deterministic.run_until_parked();
+
+    cx_a.update(|_| {
+        drop(channel_buffer);
+        drop(channel_buffer_2);
+        drop(channel_buffer_3);
+    });
+    deterministic.run_until_parked();
+
+    // The channel buffer can be reopened after dropping it.
+    let channel_buffer = client_a
+        .channel_store()
+        .update(cx_a, |store, cx| store.open_channel_buffer(channel_id, cx))
+        .await
+        .unwrap();
+    assert_ne!(channel_buffer.entity_id(), channel_buffer_model_id);
+    channel_buffer.update(cx_a, |buffer, cx| {
+        buffer.buffer().update(cx, |buffer, _| {
+            assert_eq!(buffer.text(), "hello");
+        })
+    });
+}
+
+#[gpui::test]
+async fn test_channel_buffer_disconnect(
+    deterministic: BackgroundExecutor,
+    cx_a: &mut TestAppContext,
+    cx_b: &mut TestAppContext,
+) {
+    let mut server = TestServer::start(deterministic.clone()).await;
+    let client_a = server.create_client(cx_a, "user_a").await;
+    let client_b = server.create_client(cx_b, "user_b").await;
+
+    let channel_id = server
+        .make_channel(
+            "the-channel",
+            None,
+            (&client_a, cx_a),
+            &mut [(&client_b, cx_b)],
+        )
+        .await;
+
+    let channel_buffer_a = client_a
+        .channel_store()
+        .update(cx_a, |store, cx| store.open_channel_buffer(channel_id, cx))
+        .await
+        .unwrap();
+
+    let channel_buffer_b = client_b
+        .channel_store()
+        .update(cx_b, |store, cx| store.open_channel_buffer(channel_id, cx))
+        .await
+        .unwrap();
+
+    server.forbid_connections();
+    server.disconnect_client(client_a.peer_id().unwrap());
+    deterministic.advance_clock(RECEIVE_TIMEOUT + RECONNECT_TIMEOUT);
+
+    channel_buffer_a.update(cx_a, |buffer, cx| {
+        assert_eq!(buffer.channel(cx).unwrap().name, "the-channel");
+        assert!(!buffer.is_connected());
+    });
+
+    deterministic.run_until_parked();
+
+    server.allow_connections();
+    deterministic.advance_clock(RECEIVE_TIMEOUT + RECONNECT_TIMEOUT);
+
+    deterministic.run_until_parked();
+
+    client_a
+        .channel_store()
+        .update(cx_a, |channel_store, _| {
+            channel_store.remove_channel(channel_id)
+        })
+        .await
+        .unwrap();
+    deterministic.run_until_parked();
+
+    // Channel buffer observed the deletion
+    channel_buffer_b.update(cx_b, |buffer, cx| {
+        assert!(buffer.channel(cx).is_none());
+        assert!(!buffer.is_connected());
+    });
+}
+
+#[gpui::test]
+async fn test_rejoin_channel_buffer(
+    deterministic: BackgroundExecutor,
+    cx_a: &mut TestAppContext,
+    cx_b: &mut TestAppContext,
+) {
+    let mut server = TestServer::start(deterministic.clone()).await;
+    let client_a = server.create_client(cx_a, "user_a").await;
+    let client_b = server.create_client(cx_b, "user_b").await;
+
+    let channel_id = server
+        .make_channel(
+            "the-channel",
+            None,
+            (&client_a, cx_a),
+            &mut [(&client_b, cx_b)],
+        )
+        .await;
+
+    let channel_buffer_a = client_a
+        .channel_store()
+        .update(cx_a, |store, cx| store.open_channel_buffer(channel_id, cx))
+        .await
+        .unwrap();
+    let channel_buffer_b = client_b
+        .channel_store()
+        .update(cx_b, |store, cx| store.open_channel_buffer(channel_id, cx))
+        .await
+        .unwrap();
+
+    channel_buffer_a.update(cx_a, |buffer, cx| {
+        buffer.buffer().update(cx, |buffer, cx| {
+            buffer.edit([(0..0, "1")], None, cx);
+        })
+    });
+    deterministic.run_until_parked();
+
+    // Client A disconnects.
+    server.forbid_connections();
+    server.disconnect_client(client_a.peer_id().unwrap());
+
+    // Both clients make an edit.
+    channel_buffer_a.update(cx_a, |buffer, cx| {
+        buffer.buffer().update(cx, |buffer, cx| {
+            buffer.edit([(1..1, "2")], None, cx);
+        })
+    });
+    channel_buffer_b.update(cx_b, |buffer, cx| {
+        buffer.buffer().update(cx, |buffer, cx| {
+            buffer.edit([(0..0, "0")], None, cx);
+        })
+    });
+
+    // Both clients see their own edit.
+    deterministic.run_until_parked();
+    channel_buffer_a.read_with(cx_a, |buffer, cx| {
+        assert_eq!(buffer.buffer().read(cx).text(), "12");
+    });
+    channel_buffer_b.read_with(cx_b, |buffer, cx| {
+        assert_eq!(buffer.buffer().read(cx).text(), "01");
+    });
+
+    // Client A reconnects. Both clients see each other's edits, and see
+    // the same collaborators.
+    server.allow_connections();
+    deterministic.advance_clock(RECEIVE_TIMEOUT);
+    channel_buffer_a.read_with(cx_a, |buffer, cx| {
+        assert_eq!(buffer.buffer().read(cx).text(), "012");
+    });
+    channel_buffer_b.read_with(cx_b, |buffer, cx| {
+        assert_eq!(buffer.buffer().read(cx).text(), "012");
+    });
+
+    channel_buffer_a.read_with(cx_a, |buffer_a, _| {
+        channel_buffer_b.read_with(cx_b, |buffer_b, _| {
+            assert_eq!(buffer_a.collaborators(), buffer_b.collaborators());
+        });
+    });
+}
+
+#[gpui::test]
+async fn test_channel_buffers_and_server_restarts(
+    deterministic: BackgroundExecutor,
+    cx_a: &mut TestAppContext,
+    cx_b: &mut TestAppContext,
+    cx_c: &mut TestAppContext,
+) {
+    let mut server = TestServer::start(deterministic.clone()).await;
+    let client_a = server.create_client(cx_a, "user_a").await;
+    let client_b = server.create_client(cx_b, "user_b").await;
+    let client_c = server.create_client(cx_c, "user_c").await;
+
+    let channel_id = server
+        .make_channel(
+            "the-channel",
+            None,
+            (&client_a, cx_a),
+            &mut [(&client_b, cx_b), (&client_c, cx_c)],
+        )
+        .await;
+
+    let channel_buffer_a = client_a
+        .channel_store()
+        .update(cx_a, |store, cx| store.open_channel_buffer(channel_id, cx))
+        .await
+        .unwrap();
+    let channel_buffer_b = client_b
+        .channel_store()
+        .update(cx_b, |store, cx| store.open_channel_buffer(channel_id, cx))
+        .await
+        .unwrap();
+    let _channel_buffer_c = client_c
+        .channel_store()
+        .update(cx_c, |store, cx| store.open_channel_buffer(channel_id, cx))
+        .await
+        .unwrap();
+
+    channel_buffer_a.update(cx_a, |buffer, cx| {
+        buffer.buffer().update(cx, |buffer, cx| {
+            buffer.edit([(0..0, "1")], None, cx);
+        })
+    });
+    deterministic.run_until_parked();
+
+    // Client C can't reconnect.
+    client_c.override_establish_connection(|_, cx| cx.spawn(|_| future::pending()));
+
+    // Server stops.
+    server.reset().await;
+    deterministic.advance_clock(RECEIVE_TIMEOUT);
+
+    // While the server is down, both clients make an edit.
+    channel_buffer_a.update(cx_a, |buffer, cx| {
+        buffer.buffer().update(cx, |buffer, cx| {
+            buffer.edit([(1..1, "2")], None, cx);
+        })
+    });
+    channel_buffer_b.update(cx_b, |buffer, cx| {
+        buffer.buffer().update(cx, |buffer, cx| {
+            buffer.edit([(0..0, "0")], None, cx);
+        })
+    });
+
+    // Server restarts.
+    server.start().await.unwrap();
+    deterministic.advance_clock(CLEANUP_TIMEOUT);
+
+    // Clients reconnects. Clients A and B see each other's edits, and see
+    // that client C has disconnected.
+    channel_buffer_a.read_with(cx_a, |buffer, cx| {
+        assert_eq!(buffer.buffer().read(cx).text(), "012");
+    });
+    channel_buffer_b.read_with(cx_b, |buffer, cx| {
+        assert_eq!(buffer.buffer().read(cx).text(), "012");
+    });
+
+    channel_buffer_a.read_with(cx_a, |buffer_a, _| {
+        channel_buffer_b.read_with(cx_b, |buffer_b, _| {
+            assert_collaborators(
+                buffer_a.collaborators(),
+                &[client_a.user_id(), client_b.user_id()],
+            );
+            assert_eq!(buffer_a.collaborators(), buffer_b.collaborators());
+        });
+    });
+}
+
+#[gpui::test(iterations = 10)]
+async fn test_following_to_channel_notes_without_a_shared_project(
+    deterministic: BackgroundExecutor,
+    mut cx_a: &mut TestAppContext,
+    mut cx_b: &mut TestAppContext,
+    mut cx_c: &mut TestAppContext,
+) {
+    let mut server = TestServer::start(deterministic.clone()).await;
+    let client_a = server.create_client(cx_a, "user_a").await;
+    let client_b = server.create_client(cx_b, "user_b").await;
+
+    let client_c = server.create_client(cx_c, "user_c").await;
+
+    cx_a.update(editor::init);
+    cx_b.update(editor::init);
+    cx_c.update(editor::init);
+    cx_a.update(collab_ui::channel_view::init);
+    cx_b.update(collab_ui::channel_view::init);
+    cx_c.update(collab_ui::channel_view::init);
+
+    let channel_1_id = server
+        .make_channel(
+            "channel-1",
+            None,
+            (&client_a, cx_a),
+            &mut [(&client_b, cx_b), (&client_c, cx_c)],
+        )
+        .await;
+    let channel_2_id = server
+        .make_channel(
+            "channel-2",
+            None,
+            (&client_a, cx_a),
+            &mut [(&client_b, cx_b), (&client_c, cx_c)],
+        )
+        .await;
+
+    // Clients A, B, and C join a channel.
+    let active_call_a = cx_a.read(ActiveCall::global);
+    let active_call_b = cx_b.read(ActiveCall::global);
+    let active_call_c = cx_c.read(ActiveCall::global);
+    for (call, cx) in [
+        (&active_call_a, &mut cx_a),
+        (&active_call_b, &mut cx_b),
+        (&active_call_c, &mut cx_c),
+    ] {
+        call.update(*cx, |call, cx| call.join_channel(channel_1_id, cx))
+            .await
+            .unwrap();
+    }
+    deterministic.run_until_parked();
+
+    // Clients A, B, and C all open their own unshared projects.
+    client_a.fs().insert_tree("/a", json!({})).await;
+    client_b.fs().insert_tree("/b", json!({})).await;
+    client_c.fs().insert_tree("/c", json!({})).await;
+    let (project_a, _) = client_a.build_local_project("/a", cx_a).await;
+    let (project_b, _) = client_b.build_local_project("/b", cx_b).await;
+    let (project_c, _) = client_b.build_local_project("/c", cx_c).await;
+    let (workspace_a, cx_a) = client_a.build_workspace(&project_a, cx_a);
+    let (workspace_b, cx_b) = client_b.build_workspace(&project_b, cx_b);
+    let (_workspace_c, _cx_c) = client_c.build_workspace(&project_c, cx_c);
+
+    active_call_a
+        .update(cx_a, |call, cx| call.set_location(Some(&project_a), cx))
+        .await
+        .unwrap();
+
+    // Client A opens the notes for channel 1.
+    let channel_view_1_a = cx_a
+        .update(|cx| ChannelView::open(channel_1_id, workspace_a.clone(), cx))
+        .await
+        .unwrap();
+    channel_view_1_a.update(cx_a, |notes, cx| {
+        assert_eq!(notes.channel(cx).unwrap().name, "channel-1");
+        notes.editor.update(cx, |editor, cx| {
+            editor.insert("Hello from A.", cx);
+            editor.change_selections(None, cx, |selections| {
+                selections.select_ranges(vec![3..4]);
+            });
+        });
+    });
+
+    // Client B follows client A.
+    workspace_b
+        .update(cx_b, |workspace, cx| {
+            workspace.follow(client_a.peer_id().unwrap(), cx).unwrap()
+        })
+        .await
+        .unwrap();
+
+    // Client B is taken to the notes for channel 1, with the same
+    // text selected as client A.
+    deterministic.run_until_parked();
+    let channel_view_1_b = workspace_b.update(cx_b, |workspace, cx| {
+        assert_eq!(
+            workspace.leader_for_pane(workspace.active_pane()),
+            Some(client_a.peer_id().unwrap())
+        );
+        workspace
+            .active_item(cx)
+            .expect("no active item")
+            .downcast::<ChannelView>()
+            .expect("active item is not a channel view")
+    });
+    channel_view_1_b.update(cx_b, |notes, cx| {
+        assert_eq!(notes.channel(cx).unwrap().name, "channel-1");
+        let editor = notes.editor.read(cx);
+        assert_eq!(editor.text(cx), "Hello from A.");
+        assert_eq!(editor.selections.ranges::<usize>(cx), &[3..4]);
+    });
+
+    // Client A opens the notes for channel 2.
+    eprintln!("opening -------------------->");
+
+    let channel_view_2_a = cx_a
+        .update(|cx| ChannelView::open(channel_2_id, workspace_a.clone(), cx))
+        .await
+        .unwrap();
+    channel_view_2_a.update(cx_a, |notes, cx| {
+        assert_eq!(notes.channel(cx).unwrap().name, "channel-2");
+    });
+
+    // Client B is taken to the notes for channel 2.
+    deterministic.run_until_parked();
+
+    eprintln!("opening <--------------------");
+
+    let channel_view_2_b = workspace_b.update(cx_b, |workspace, cx| {
+        assert_eq!(
+            workspace.leader_for_pane(workspace.active_pane()),
+            Some(client_a.peer_id().unwrap())
+        );
+        workspace
+            .active_item(cx)
+            .expect("no active item")
+            .downcast::<ChannelView>()
+            .expect("active item is not a channel view")
+    });
+    channel_view_2_b.update(cx_b, |notes, cx| {
+        assert_eq!(notes.channel(cx).unwrap().name, "channel-2");
+    });
+}
+
+#[gpui::test]
+async fn test_channel_buffer_changes(
+    deterministic: BackgroundExecutor,
+    cx_a: &mut TestAppContext,
+    cx_b: &mut TestAppContext,
+) {
+    let mut server = TestServer::start(deterministic.clone()).await;
+    let client_a = server.create_client(cx_a, "user_a").await;
+    let client_b = server.create_client(cx_b, "user_b").await;
+
+    let channel_id = server
+        .make_channel(
+            "the-channel",
+            None,
+            (&client_a, cx_a),
+            &mut [(&client_b, cx_b)],
+        )
+        .await;
+
+    let channel_buffer_a = client_a
+        .channel_store()
+        .update(cx_a, |store, cx| store.open_channel_buffer(channel_id, cx))
+        .await
+        .unwrap();
+
+    // Client A makes an edit, and client B should see that the note has changed.
+    channel_buffer_a.update(cx_a, |buffer, cx| {
+        buffer.buffer().update(cx, |buffer, cx| {
+            buffer.edit([(0..0, "1")], None, cx);
+        })
+    });
+    deterministic.run_until_parked();
+
+    let has_buffer_changed = cx_b.update(|cx| {
+        client_b
+            .channel_store()
+            .read(cx)
+            .has_channel_buffer_changed(channel_id)
+            .unwrap()
+    });
+    assert!(has_buffer_changed);
+
+    // Opening the buffer should clear the changed flag.
+    let project_b = client_b.build_empty_local_project(cx_b);
+    let (workspace_b, cx_b) = client_b.build_workspace(&project_b, cx_b);
+    let channel_view_b = cx_b
+        .update(|cx| ChannelView::open(channel_id, workspace_b.clone(), cx))
+        .await
+        .unwrap();
+    deterministic.run_until_parked();
+
+    let has_buffer_changed = cx_b.update(|cx| {
+        client_b
+            .channel_store()
+            .read(cx)
+            .has_channel_buffer_changed(channel_id)
+            .unwrap()
+    });
+    assert!(!has_buffer_changed);
+
+    // Editing the channel while the buffer is open should not show that the buffer has changed.
+    channel_buffer_a.update(cx_a, |buffer, cx| {
+        buffer.buffer().update(cx, |buffer, cx| {
+            buffer.edit([(0..0, "2")], None, cx);
+        })
+    });
+    deterministic.run_until_parked();
+
+    let has_buffer_changed = cx_b.read(|cx| {
+        client_b
+            .channel_store()
+            .read(cx)
+            .has_channel_buffer_changed(channel_id)
+            .unwrap()
+    });
+    assert!(!has_buffer_changed);
+
+    deterministic.advance_clock(ACKNOWLEDGE_DEBOUNCE_INTERVAL);
+
+    // Test that the server is tracking things correctly, and we retain our 'not changed'
+    // state across a disconnect
+    server
+        .simulate_long_connection_interruption(client_b.peer_id().unwrap(), deterministic.clone());
+    let has_buffer_changed = cx_b.read(|cx| {
+        client_b
+            .channel_store()
+            .read(cx)
+            .has_channel_buffer_changed(channel_id)
+            .unwrap()
+    });
+    assert!(!has_buffer_changed);
+
+    // Closing the buffer should re-enable change tracking
+    cx_b.update(|cx| {
+        workspace_b.update(cx, |workspace, cx| {
+            workspace.close_all_items_and_panes(&Default::default(), cx)
+        });
+
+        drop(channel_view_b)
+    });
+
+    deterministic.run_until_parked();
+
+    channel_buffer_a.update(cx_a, |buffer, cx| {
+        buffer.buffer().update(cx, |buffer, cx| {
+            buffer.edit([(0..0, "3")], None, cx);
+        })
+    });
+    deterministic.run_until_parked();
+
+    let has_buffer_changed = cx_b.read(|cx| {
+        client_b
+            .channel_store()
+            .read(cx)
+            .has_channel_buffer_changed(channel_id)
+            .unwrap()
+    });
+    assert!(has_buffer_changed);
+}
+
+#[track_caller]
+fn assert_collaborators(collaborators: &HashMap<PeerId, Collaborator>, ids: &[Option<UserId>]) {
+    let mut user_ids = collaborators
+        .values()
+        .map(|collaborator| collaborator.user_id)
+        .collect::<Vec<_>>();
+    user_ids.sort();
+    assert_eq!(
+        user_ids,
+        ids.into_iter().map(|id| id.unwrap()).collect::<Vec<_>>()
+    );
+}
+
+fn buffer_text(channel_buffer: &Model<language::Buffer>, cx: &mut TestAppContext) -> String {
+    channel_buffer.read_with(cx, |buffer, _| buffer.text())
+}

crates/collab2/src/tests/test_server.rs 🔗

@@ -13,7 +13,7 @@ use client::{
 use collections::{HashMap, HashSet};
 use fs::FakeFs;
 use futures::{channel::oneshot, StreamExt as _};
-use gpui::{BackgroundExecutor, Context, Model, TestAppContext, WindowHandle};
+use gpui::{BackgroundExecutor, Context, Model, TestAppContext, View, VisualTestContext};
 use language::LanguageRegistry;
 use node_runtime::FakeNodeRuntime;
 
@@ -602,14 +602,12 @@ impl TestClient {
         .unwrap()
     }
 
-    //todo(workspace)
-    #[allow(dead_code)]
-    pub fn build_workspace(
-        &self,
+    pub fn build_workspace<'a>(
+        &'a self,
         project: &Model<Project>,
-        cx: &mut TestAppContext,
-    ) -> WindowHandle<Workspace> {
-        cx.add_window(|cx| Workspace::new(0, project.clone(), self.app_state.clone(), cx))
+        cx: &'a mut TestAppContext,
+    ) -> (View<Workspace>, &'a mut VisualTestContext) {
+        cx.add_window_view(|cx| Workspace::new(0, project.clone(), self.app_state.clone(), cx))
     }
 }
 

crates/collab_ui2/src/channel_view.rs 🔗

@@ -1,454 +1,444 @@
-// use anyhow::{anyhow, Result};
-// use call::report_call_event_for_channel;
-// use channel::{Channel, ChannelBuffer, ChannelBufferEvent, ChannelId, ChannelStore};
-// use client::{
-//     proto::{self, PeerId},
-//     Collaborator, ParticipantIndex,
-// };
-// use collections::HashMap;
-// use editor::{CollaborationHub, Editor};
-// use gpui::{
-//     actions,
-//     elements::{ChildView, Label},
-//     geometry::vector::Vector2F,
-//     AnyElement, AnyViewHandle, AppContext, Element, Entity, ModelHandle, Subscription, Task, View,
-//     ViewContext, ViewHandle,
-// };
-// use project::Project;
-// use smallvec::SmallVec;
-// use std::{
-//     any::{Any, TypeId},
-//     sync::Arc,
-// };
-// use util::ResultExt;
-// use workspace::{
-//     item::{FollowableItem, Item, ItemEvent, ItemHandle},
-//     register_followable_item,
-//     searchable::SearchableItemHandle,
-//     ItemNavHistory, Pane, SaveIntent, ViewId, Workspace, WorkspaceId,
-// };
-
-// actions!(channel_view, [Deploy]);
-
-// pub fn init(cx: &mut AppContext) {
-//     register_followable_item::<ChannelView>(cx)
-// }
-
-// pub struct ChannelView {
-//     pub editor: ViewHandle<Editor>,
-//     project: ModelHandle<Project>,
-//     channel_store: ModelHandle<ChannelStore>,
-//     channel_buffer: ModelHandle<ChannelBuffer>,
-//     remote_id: Option<ViewId>,
-//     _editor_event_subscription: Subscription,
-// }
-
-// impl ChannelView {
-//     pub fn open(
-//         channel_id: ChannelId,
-//         workspace: ViewHandle<Workspace>,
-//         cx: &mut AppContext,
-//     ) -> Task<Result<ViewHandle<Self>>> {
-//         let pane = workspace.read(cx).active_pane().clone();
-//         let channel_view = Self::open_in_pane(channel_id, pane.clone(), workspace.clone(), cx);
-//         cx.spawn(|mut cx| async move {
-//             let channel_view = channel_view.await?;
-//             pane.update(&mut cx, |pane, cx| {
-//                 report_call_event_for_channel(
-//                     "open channel notes",
-//                     channel_id,
-//                     &workspace.read(cx).app_state().client,
-//                     cx,
-//                 );
-//                 pane.add_item(Box::new(channel_view.clone()), true, true, None, cx);
-//             });
-//             anyhow::Ok(channel_view)
-//         })
-//     }
-
-//     pub fn open_in_pane(
-//         channel_id: ChannelId,
-//         pane: ViewHandle<Pane>,
-//         workspace: ViewHandle<Workspace>,
-//         cx: &mut AppContext,
-//     ) -> Task<Result<ViewHandle<Self>>> {
-//         let workspace = workspace.read(cx);
-//         let project = workspace.project().to_owned();
-//         let channel_store = ChannelStore::global(cx);
-//         let language_registry = workspace.app_state().languages.clone();
-//         let markdown = language_registry.language_for_name("Markdown");
-//         let channel_buffer =
-//             channel_store.update(cx, |store, cx| store.open_channel_buffer(channel_id, cx));
-
-//         cx.spawn(|mut cx| async move {
-//             let channel_buffer = channel_buffer.await?;
-//             let markdown = markdown.await.log_err();
-
-//             channel_buffer.update(&mut cx, |buffer, cx| {
-//                 buffer.buffer().update(cx, |buffer, cx| {
-//                     buffer.set_language_registry(language_registry);
-//                     if let Some(markdown) = markdown {
-//                         buffer.set_language(Some(markdown), cx);
-//                     }
-//                 })
-//             });
-
-//             pane.update(&mut cx, |pane, cx| {
-//                 let buffer_id = channel_buffer.read(cx).remote_id(cx);
-
-//                 let existing_view = pane
-//                     .items_of_type::<Self>()
-//                     .find(|view| view.read(cx).channel_buffer.read(cx).remote_id(cx) == buffer_id);
-
-//                 // If this channel buffer is already open in this pane, just return it.
-//                 if let Some(existing_view) = existing_view.clone() {
-//                     if existing_view.read(cx).channel_buffer == channel_buffer {
-//                         return existing_view;
-//                     }
-//                 }
-
-//                 let view = cx.add_view(|cx| {
-//                     let mut this = Self::new(project, channel_store, channel_buffer, cx);
-//                     this.acknowledge_buffer_version(cx);
-//                     this
-//                 });
-
-//                 // If the pane contained a disconnected view for this channel buffer,
-//                 // replace that.
-//                 if let Some(existing_item) = existing_view {
-//                     if let Some(ix) = pane.index_for_item(&existing_item) {
-//                         pane.close_item_by_id(existing_item.id(), SaveIntent::Skip, cx)
-//                             .detach();
-//                         pane.add_item(Box::new(view.clone()), true, true, Some(ix), cx);
-//                     }
-//                 }
-
-//                 view
-//             })
-//             .ok_or_else(|| anyhow!("pane was dropped"))
-//         })
-//     }
-
-//     pub fn new(
-//         project: ModelHandle<Project>,
-//         channel_store: ModelHandle<ChannelStore>,
-//         channel_buffer: ModelHandle<ChannelBuffer>,
-//         cx: &mut ViewContext<Self>,
-//     ) -> Self {
-//         let buffer = channel_buffer.read(cx).buffer();
-//         let editor = cx.add_view(|cx| {
-//             let mut editor = Editor::for_buffer(buffer, None, cx);
-//             editor.set_collaboration_hub(Box::new(ChannelBufferCollaborationHub(
-//                 channel_buffer.clone(),
-//             )));
-//             editor.set_read_only(
-//                 !channel_buffer
-//                     .read(cx)
-//                     .channel(cx)
-//                     .is_some_and(|c| c.can_edit_notes()),
-//             );
-//             editor
-//         });
-//         let _editor_event_subscription = cx.subscribe(&editor, |_, _, e, cx| cx.emit(e.clone()));
-
-//         cx.subscribe(&channel_buffer, Self::handle_channel_buffer_event)
-//             .detach();
-
-//         Self {
-//             editor,
-//             project,
-//             channel_store,
-//             channel_buffer,
-//             remote_id: None,
-//             _editor_event_subscription,
-//         }
-//     }
-
-//     pub fn channel(&self, cx: &AppContext) -> Option<Arc<Channel>> {
-//         self.channel_buffer.read(cx).channel(cx)
-//     }
-
-//     fn handle_channel_buffer_event(
-//         &mut self,
-//         _: ModelHandle<ChannelBuffer>,
-//         event: &ChannelBufferEvent,
-//         cx: &mut ViewContext<Self>,
-//     ) {
-//         match event {
-//             ChannelBufferEvent::Disconnected => self.editor.update(cx, |editor, cx| {
-//                 editor.set_read_only(true);
-//                 cx.notify();
-//             }),
-//             ChannelBufferEvent::ChannelChanged => {
-//                 self.editor.update(cx, |editor, cx| {
-//                     editor.set_read_only(!self.channel(cx).is_some_and(|c| c.can_edit_notes()));
-//                     cx.emit(editor::Event::TitleChanged);
-//                     cx.notify()
-//                 });
-//             }
-//             ChannelBufferEvent::BufferEdited => {
-//                 if cx.is_self_focused() || self.editor.is_focused(cx) {
-//                     self.acknowledge_buffer_version(cx);
-//                 } else {
-//                     self.channel_store.update(cx, |store, cx| {
-//                         let channel_buffer = self.channel_buffer.read(cx);
-//                         store.notes_changed(
-//                             channel_buffer.channel_id,
-//                             channel_buffer.epoch(),
-//                             &channel_buffer.buffer().read(cx).version(),
-//                             cx,
-//                         )
-//                     });
-//                 }
-//             }
-//             ChannelBufferEvent::CollaboratorsChanged => {}
-//         }
-//     }
-
-//     fn acknowledge_buffer_version(&mut self, cx: &mut ViewContext<'_, '_, ChannelView>) {
-//         self.channel_store.update(cx, |store, cx| {
-//             let channel_buffer = self.channel_buffer.read(cx);
-//             store.acknowledge_notes_version(
-//                 channel_buffer.channel_id,
-//                 channel_buffer.epoch(),
-//                 &channel_buffer.buffer().read(cx).version(),
-//                 cx,
-//             )
-//         });
-//         self.channel_buffer.update(cx, |buffer, cx| {
-//             buffer.acknowledge_buffer_version(cx);
-//         });
-//     }
-// }
-
-// impl Entity for ChannelView {
-//     type Event = editor::Event;
-// }
-
-// impl View for ChannelView {
-//     fn ui_name() -> &'static str {
-//         "ChannelView"
-//     }
-
-//     fn render(&mut self, cx: &mut ViewContext<Self>) -> AnyElement<Self> {
-//         ChildView::new(self.editor.as_any(), cx).into_any()
-//     }
-
-//     fn focus_in(&mut self, _: AnyViewHandle, cx: &mut ViewContext<Self>) {
-//         if cx.is_self_focused() {
-//             self.acknowledge_buffer_version(cx);
-//             cx.focus(self.editor.as_any())
-//         }
-//     }
-// }
-
-// impl Item for ChannelView {
-//     fn act_as_type<'a>(
-//         &'a self,
-//         type_id: TypeId,
-//         self_handle: &'a ViewHandle<Self>,
-//         _: &'a AppContext,
-//     ) -> Option<&'a AnyViewHandle> {
-//         if type_id == TypeId::of::<Self>() {
-//             Some(self_handle)
-//         } else if type_id == TypeId::of::<Editor>() {
-//             Some(&self.editor)
-//         } else {
-//             None
-//         }
-//     }
-
-//     fn tab_content<V: 'static>(
-//         &self,
-//         _: Option<usize>,
-//         style: &theme::Tab,
-//         cx: &gpui::AppContext,
-//     ) -> AnyElement<V> {
-//         let label = if let Some(channel) = self.channel(cx) {
-//             match (
-//                 channel.can_edit_notes(),
-//                 self.channel_buffer.read(cx).is_connected(),
-//             ) {
-//                 (true, true) => format!("#{}", channel.name),
-//                 (false, true) => format!("#{} (read-only)", channel.name),
-//                 (_, false) => format!("#{} (disconnected)", channel.name),
-//             }
-//         } else {
-//             format!("channel notes (disconnected)")
-//         };
-//         Label::new(label, style.label.to_owned()).into_any()
-//     }
-
-//     fn clone_on_split(&self, _: WorkspaceId, cx: &mut ViewContext<Self>) -> Option<Self> {
-//         Some(Self::new(
-//             self.project.clone(),
-//             self.channel_store.clone(),
-//             self.channel_buffer.clone(),
-//             cx,
-//         ))
-//     }
-
-//     fn is_singleton(&self, _cx: &AppContext) -> bool {
-//         false
-//     }
-
-//     fn navigate(&mut self, data: Box<dyn Any>, cx: &mut ViewContext<Self>) -> bool {
-//         self.editor
-//             .update(cx, |editor, cx| editor.navigate(data, cx))
-//     }
-
-//     fn deactivated(&mut self, cx: &mut ViewContext<Self>) {
-//         self.editor
-//             .update(cx, |editor, cx| Item::deactivated(editor, cx))
-//     }
-
-//     fn set_nav_history(&mut self, history: ItemNavHistory, cx: &mut ViewContext<Self>) {
-//         self.editor
-//             .update(cx, |editor, cx| Item::set_nav_history(editor, history, cx))
-//     }
-
-//     fn as_searchable(&self, _: &ViewHandle<Self>) -> Option<Box<dyn SearchableItemHandle>> {
-//         Some(Box::new(self.editor.clone()))
-//     }
-
-//     fn show_toolbar(&self) -> bool {
-//         true
-//     }
-
-//     fn pixel_position_of_cursor(&self, cx: &AppContext) -> Option<Vector2F> {
-//         self.editor.read(cx).pixel_position_of_cursor(cx)
-//     }
-
-//     fn to_item_events(event: &Self::Event) -> SmallVec<[ItemEvent; 2]> {
-//         editor::Editor::to_item_events(event)
-//     }
-// }
-
-// impl FollowableItem for ChannelView {
-//     fn remote_id(&self) -> Option<workspace::ViewId> {
-//         self.remote_id
-//     }
-
-//     fn to_state_proto(&self, cx: &AppContext) -> Option<proto::view::Variant> {
-//         let channel_buffer = self.channel_buffer.read(cx);
-//         if !channel_buffer.is_connected() {
-//             return None;
-//         }
-
-//         Some(proto::view::Variant::ChannelView(
-//             proto::view::ChannelView {
-//                 channel_id: channel_buffer.channel_id,
-//                 editor: if let Some(proto::view::Variant::Editor(proto)) =
-//                     self.editor.read(cx).to_state_proto(cx)
-//                 {
-//                     Some(proto)
-//                 } else {
-//                     None
-//                 },
-//             },
-//         ))
-//     }
-
-//     fn from_state_proto(
-//         pane: ViewHandle<workspace::Pane>,
-//         workspace: ViewHandle<workspace::Workspace>,
-//         remote_id: workspace::ViewId,
-//         state: &mut Option<proto::view::Variant>,
-//         cx: &mut AppContext,
-//     ) -> Option<gpui::Task<anyhow::Result<ViewHandle<Self>>>> {
-//         let Some(proto::view::Variant::ChannelView(_)) = state else {
-//             return None;
-//         };
-//         let Some(proto::view::Variant::ChannelView(state)) = state.take() else {
-//             unreachable!()
-//         };
-
-//         let open = ChannelView::open_in_pane(state.channel_id, pane, workspace, cx);
-
-//         Some(cx.spawn(|mut cx| async move {
-//             let this = open.await?;
-
-//             let task = this
-//                 .update(&mut cx, |this, cx| {
-//                     this.remote_id = Some(remote_id);
-
-//                     if let Some(state) = state.editor {
-//                         Some(this.editor.update(cx, |editor, cx| {
-//                             editor.apply_update_proto(
-//                                 &this.project,
-//                                 proto::update_view::Variant::Editor(proto::update_view::Editor {
-//                                     selections: state.selections,
-//                                     pending_selection: state.pending_selection,
-//                                     scroll_top_anchor: state.scroll_top_anchor,
-//                                     scroll_x: state.scroll_x,
-//                                     scroll_y: state.scroll_y,
-//                                     ..Default::default()
-//                                 }),
-//                                 cx,
-//                             )
-//                         }))
-//                     } else {
-//                         None
-//                     }
-//                 })
-//                 .ok_or_else(|| anyhow!("window was closed"))?;
-
-//             if let Some(task) = task {
-//                 task.await?;
-//             }
-
-//             Ok(this)
-//         }))
-//     }
-
-//     fn add_event_to_update_proto(
-//         &self,
-//         event: &Self::Event,
-//         update: &mut Option<proto::update_view::Variant>,
-//         cx: &AppContext,
-//     ) -> bool {
-//         self.editor
-//             .read(cx)
-//             .add_event_to_update_proto(event, update, cx)
-//     }
-
-//     fn apply_update_proto(
-//         &mut self,
-//         project: &ModelHandle<Project>,
-//         message: proto::update_view::Variant,
-//         cx: &mut ViewContext<Self>,
-//     ) -> gpui::Task<anyhow::Result<()>> {
-//         self.editor.update(cx, |editor, cx| {
-//             editor.apply_update_proto(project, message, cx)
-//         })
-//     }
-
-//     fn set_leader_peer_id(&mut self, leader_peer_id: Option<PeerId>, cx: &mut ViewContext<Self>) {
-//         self.editor.update(cx, |editor, cx| {
-//             editor.set_leader_peer_id(leader_peer_id, cx)
-//         })
-//     }
-
-//     fn should_unfollow_on_event(event: &Self::Event, cx: &AppContext) -> bool {
-//         Editor::should_unfollow_on_event(event, cx)
-//     }
-
-//     fn is_project_item(&self, _cx: &AppContext) -> bool {
-//         false
-//     }
-// }
-
-// struct ChannelBufferCollaborationHub(ModelHandle<ChannelBuffer>);
-
-// impl CollaborationHub for ChannelBufferCollaborationHub {
-//     fn collaborators<'a>(&self, cx: &'a AppContext) -> &'a HashMap<PeerId, Collaborator> {
-//         self.0.read(cx).collaborators()
-//     }
-
-//     fn user_participant_indices<'a>(
-//         &self,
-//         cx: &'a AppContext,
-//     ) -> &'a HashMap<u64, ParticipantIndex> {
-//         self.0.read(cx).user_store().read(cx).participant_indices()
-//     }
-// }
+use anyhow::Result;
+use call::report_call_event_for_channel;
+use channel::{Channel, ChannelBuffer, ChannelBufferEvent, ChannelId, ChannelStore};
+use client::{
+    proto::{self, PeerId},
+    Collaborator, ParticipantIndex,
+};
+use collections::HashMap;
+use editor::{CollaborationHub, Editor, EditorEvent};
+use gpui::{
+    actions, AnyElement, AnyView, AppContext, Entity as _, EventEmitter, FocusableView,
+    IntoElement as _, Model, Pixels, Point, Render, Subscription, Task, View, ViewContext,
+    VisualContext as _, WindowContext,
+};
+use project::Project;
+use std::{
+    any::{Any, TypeId},
+    sync::Arc,
+};
+use ui::Label;
+use util::ResultExt;
+use workspace::{
+    item::{FollowableItem, Item, ItemEvent, ItemHandle},
+    register_followable_item,
+    searchable::SearchableItemHandle,
+    ItemNavHistory, Pane, SaveIntent, ViewId, Workspace, WorkspaceId,
+};
+
+actions!(Deploy);
+
+pub fn init(cx: &mut AppContext) {
+    register_followable_item::<ChannelView>(cx)
+}
+
+pub struct ChannelView {
+    pub editor: View<Editor>,
+    project: Model<Project>,
+    channel_store: Model<ChannelStore>,
+    channel_buffer: Model<ChannelBuffer>,
+    remote_id: Option<ViewId>,
+    _editor_event_subscription: Subscription,
+}
+
+impl ChannelView {
+    pub fn open(
+        channel_id: ChannelId,
+        workspace: View<Workspace>,
+        cx: &mut WindowContext,
+    ) -> Task<Result<View<Self>>> {
+        let pane = workspace.read(cx).active_pane().clone();
+        let channel_view = Self::open_in_pane(channel_id, pane.clone(), workspace.clone(), cx);
+        cx.spawn(|mut cx| async move {
+            let channel_view = channel_view.await?;
+            pane.update(&mut cx, |pane, cx| {
+                report_call_event_for_channel(
+                    "open channel notes",
+                    channel_id,
+                    &workspace.read(cx).app_state().client,
+                    cx,
+                );
+                pane.add_item(Box::new(channel_view.clone()), true, true, None, cx);
+            })?;
+            anyhow::Ok(channel_view)
+        })
+    }
+
+    pub fn open_in_pane(
+        channel_id: ChannelId,
+        pane: View<Pane>,
+        workspace: View<Workspace>,
+        cx: &mut WindowContext,
+    ) -> Task<Result<View<Self>>> {
+        let workspace = workspace.read(cx);
+        let project = workspace.project().to_owned();
+        let channel_store = ChannelStore::global(cx);
+        let language_registry = workspace.app_state().languages.clone();
+        let markdown = language_registry.language_for_name("Markdown");
+        let channel_buffer =
+            channel_store.update(cx, |store, cx| store.open_channel_buffer(channel_id, cx));
+
+        cx.spawn(|mut cx| async move {
+            let channel_buffer = channel_buffer.await?;
+            let markdown = markdown.await.log_err();
+
+            channel_buffer.update(&mut cx, |buffer, cx| {
+                buffer.buffer().update(cx, |buffer, cx| {
+                    buffer.set_language_registry(language_registry);
+                    if let Some(markdown) = markdown {
+                        buffer.set_language(Some(markdown), cx);
+                    }
+                })
+            })?;
+
+            pane.update(&mut cx, |pane, cx| {
+                let buffer_id = channel_buffer.read(cx).remote_id(cx);
+
+                let existing_view = pane
+                    .items_of_type::<Self>()
+                    .find(|view| view.read(cx).channel_buffer.read(cx).remote_id(cx) == buffer_id);
+
+                // If this channel buffer is already open in this pane, just return it.
+                if let Some(existing_view) = existing_view.clone() {
+                    if existing_view.read(cx).channel_buffer == channel_buffer {
+                        return existing_view;
+                    }
+                }
+
+                let view = cx.build_view(|cx| {
+                    let mut this = Self::new(project, channel_store, channel_buffer, cx);
+                    this.acknowledge_buffer_version(cx);
+                    this
+                });
+
+                // If the pane contained a disconnected view for this channel buffer,
+                // replace that.
+                if let Some(existing_item) = existing_view {
+                    if let Some(ix) = pane.index_for_item(&existing_item) {
+                        pane.close_item_by_id(existing_item.entity_id(), SaveIntent::Skip, cx)
+                            .detach();
+                        pane.add_item(Box::new(view.clone()), true, true, Some(ix), cx);
+                    }
+                }
+
+                view
+            })
+        })
+    }
+
+    pub fn new(
+        project: Model<Project>,
+        channel_store: Model<ChannelStore>,
+        channel_buffer: Model<ChannelBuffer>,
+        cx: &mut ViewContext<Self>,
+    ) -> Self {
+        let buffer = channel_buffer.read(cx).buffer();
+        let editor = cx.build_view(|cx| {
+            let mut editor = Editor::for_buffer(buffer, None, cx);
+            editor.set_collaboration_hub(Box::new(ChannelBufferCollaborationHub(
+                channel_buffer.clone(),
+            )));
+            editor.set_read_only(
+                !channel_buffer
+                    .read(cx)
+                    .channel(cx)
+                    .is_some_and(|c| c.can_edit_notes()),
+            );
+            editor
+        });
+        let _editor_event_subscription =
+            cx.subscribe(&editor, |_, _, e: &EditorEvent, cx| cx.emit(e.clone()));
+
+        cx.subscribe(&channel_buffer, Self::handle_channel_buffer_event)
+            .detach();
+
+        Self {
+            editor,
+            project,
+            channel_store,
+            channel_buffer,
+            remote_id: None,
+            _editor_event_subscription,
+        }
+    }
+
+    pub fn channel(&self, cx: &AppContext) -> Option<Arc<Channel>> {
+        self.channel_buffer.read(cx).channel(cx)
+    }
+
+    fn handle_channel_buffer_event(
+        &mut self,
+        _: Model<ChannelBuffer>,
+        event: &ChannelBufferEvent,
+        cx: &mut ViewContext<Self>,
+    ) {
+        match event {
+            ChannelBufferEvent::Disconnected => self.editor.update(cx, |editor, cx| {
+                editor.set_read_only(true);
+                cx.notify();
+            }),
+            ChannelBufferEvent::ChannelChanged => {
+                self.editor.update(cx, |editor, cx| {
+                    editor.set_read_only(!self.channel(cx).is_some_and(|c| c.can_edit_notes()));
+                    cx.emit(editor::EditorEvent::TitleChanged);
+                    cx.notify()
+                });
+            }
+            ChannelBufferEvent::BufferEdited => {
+                if self.editor.read(cx).is_focused(cx) {
+                    self.acknowledge_buffer_version(cx);
+                } else {
+                    self.channel_store.update(cx, |store, cx| {
+                        let channel_buffer = self.channel_buffer.read(cx);
+                        store.notes_changed(
+                            channel_buffer.channel_id,
+                            channel_buffer.epoch(),
+                            &channel_buffer.buffer().read(cx).version(),
+                            cx,
+                        )
+                    });
+                }
+            }
+            ChannelBufferEvent::CollaboratorsChanged => {}
+        }
+    }
+
+    fn acknowledge_buffer_version(&mut self, cx: &mut ViewContext<ChannelView>) {
+        self.channel_store.update(cx, |store, cx| {
+            let channel_buffer = self.channel_buffer.read(cx);
+            store.acknowledge_notes_version(
+                channel_buffer.channel_id,
+                channel_buffer.epoch(),
+                &channel_buffer.buffer().read(cx).version(),
+                cx,
+            )
+        });
+        self.channel_buffer.update(cx, |buffer, cx| {
+            buffer.acknowledge_buffer_version(cx);
+        });
+    }
+}
+
+impl EventEmitter<EditorEvent> for ChannelView {}
+
+impl Render for ChannelView {
+    type Element = AnyView;
+
+    fn render(&mut self, _cx: &mut ViewContext<Self>) -> Self::Element {
+        self.editor.clone().into()
+    }
+}
+
+impl FocusableView for ChannelView {
+    fn focus_handle(&self, cx: &AppContext) -> gpui::FocusHandle {
+        self.editor.read(cx).focus_handle(cx)
+    }
+}
+
+impl Item for ChannelView {
+    type Event = EditorEvent;
+
+    fn act_as_type<'a>(
+        &'a self,
+        type_id: TypeId,
+        self_handle: &'a View<Self>,
+        _: &'a AppContext,
+    ) -> Option<AnyView> {
+        if type_id == TypeId::of::<Self>() {
+            Some(self_handle.to_any())
+        } else if type_id == TypeId::of::<Editor>() {
+            Some(self.editor.to_any())
+        } else {
+            None
+        }
+    }
+
+    fn tab_content(&self, _: Option<usize>, cx: &WindowContext) -> AnyElement {
+        let label = if let Some(channel) = self.channel(cx) {
+            match (
+                channel.can_edit_notes(),
+                self.channel_buffer.read(cx).is_connected(),
+            ) {
+                (true, true) => format!("#{}", channel.name),
+                (false, true) => format!("#{} (read-only)", channel.name),
+                (_, false) => format!("#{} (disconnected)", channel.name),
+            }
+        } else {
+            format!("channel notes (disconnected)")
+        };
+        Label::new(label).into_any_element()
+    }
+
+    fn clone_on_split(&self, _: WorkspaceId, cx: &mut ViewContext<Self>) -> Option<View<Self>> {
+        Some(cx.build_view(|cx| {
+            Self::new(
+                self.project.clone(),
+                self.channel_store.clone(),
+                self.channel_buffer.clone(),
+                cx,
+            )
+        }))
+    }
+
+    fn is_singleton(&self, _cx: &AppContext) -> bool {
+        false
+    }
+
+    fn navigate(&mut self, data: Box<dyn Any>, cx: &mut ViewContext<Self>) -> bool {
+        self.editor
+            .update(cx, |editor, cx| editor.navigate(data, cx))
+    }
+
+    fn deactivated(&mut self, cx: &mut ViewContext<Self>) {
+        self.editor
+            .update(cx, |editor, cx| Item::deactivated(editor, cx))
+    }
+
+    fn set_nav_history(&mut self, history: ItemNavHistory, cx: &mut ViewContext<Self>) {
+        self.editor
+            .update(cx, |editor, cx| Item::set_nav_history(editor, history, cx))
+    }
+
+    fn as_searchable(&self, _: &View<Self>) -> Option<Box<dyn SearchableItemHandle>> {
+        Some(Box::new(self.editor.clone()))
+    }
+
+    fn show_toolbar(&self) -> bool {
+        true
+    }
+
+    fn pixel_position_of_cursor(&self, cx: &AppContext) -> Option<Point<Pixels>> {
+        self.editor.read(cx).pixel_position_of_cursor(cx)
+    }
+
+    fn to_item_events(event: &EditorEvent, f: impl FnMut(ItemEvent)) {
+        Editor::to_item_events(event, f)
+    }
+}
+
+impl FollowableItem for ChannelView {
+    fn remote_id(&self) -> Option<workspace::ViewId> {
+        self.remote_id
+    }
+
+    fn to_state_proto(&self, cx: &WindowContext) -> Option<proto::view::Variant> {
+        let channel_buffer = self.channel_buffer.read(cx);
+        if !channel_buffer.is_connected() {
+            return None;
+        }
+
+        Some(proto::view::Variant::ChannelView(
+            proto::view::ChannelView {
+                channel_id: channel_buffer.channel_id,
+                editor: if let Some(proto::view::Variant::Editor(proto)) =
+                    self.editor.read(cx).to_state_proto(cx)
+                {
+                    Some(proto)
+                } else {
+                    None
+                },
+            },
+        ))
+    }
+
+    fn from_state_proto(
+        pane: View<workspace::Pane>,
+        workspace: View<workspace::Workspace>,
+        remote_id: workspace::ViewId,
+        state: &mut Option<proto::view::Variant>,
+        cx: &mut WindowContext,
+    ) -> Option<gpui::Task<anyhow::Result<View<Self>>>> {
+        let Some(proto::view::Variant::ChannelView(_)) = state else {
+            return None;
+        };
+        let Some(proto::view::Variant::ChannelView(state)) = state.take() else {
+            unreachable!()
+        };
+
+        let open = ChannelView::open_in_pane(state.channel_id, pane, workspace, cx);
+
+        Some(cx.spawn(|mut cx| async move {
+            let this = open.await?;
+
+            let task = this.update(&mut cx, |this, cx| {
+                this.remote_id = Some(remote_id);
+
+                if let Some(state) = state.editor {
+                    Some(this.editor.update(cx, |editor, cx| {
+                        editor.apply_update_proto(
+                            &this.project,
+                            proto::update_view::Variant::Editor(proto::update_view::Editor {
+                                selections: state.selections,
+                                pending_selection: state.pending_selection,
+                                scroll_top_anchor: state.scroll_top_anchor,
+                                scroll_x: state.scroll_x,
+                                scroll_y: state.scroll_y,
+                                ..Default::default()
+                            }),
+                            cx,
+                        )
+                    }))
+                } else {
+                    None
+                }
+            })?;
+
+            if let Some(task) = task {
+                task.await?;
+            }
+
+            Ok(this)
+        }))
+    }
+
+    fn add_event_to_update_proto(
+        &self,
+        event: &EditorEvent,
+        update: &mut Option<proto::update_view::Variant>,
+        cx: &WindowContext,
+    ) -> bool {
+        self.editor
+            .read(cx)
+            .add_event_to_update_proto(event, update, cx)
+    }
+
+    fn apply_update_proto(
+        &mut self,
+        project: &Model<Project>,
+        message: proto::update_view::Variant,
+        cx: &mut ViewContext<Self>,
+    ) -> gpui::Task<anyhow::Result<()>> {
+        self.editor.update(cx, |editor, cx| {
+            editor.apply_update_proto(project, message, cx)
+        })
+    }
+
+    fn set_leader_peer_id(&mut self, leader_peer_id: Option<PeerId>, cx: &mut ViewContext<Self>) {
+        self.editor.update(cx, |editor, cx| {
+            editor.set_leader_peer_id(leader_peer_id, cx)
+        })
+    }
+
+    fn is_project_item(&self, _cx: &WindowContext) -> bool {
+        false
+    }
+
+    fn to_follow_event(event: &Self::Event) -> Option<workspace::item::FollowEvent> {
+        Editor::to_follow_event(event)
+    }
+}
+
+struct ChannelBufferCollaborationHub(Model<ChannelBuffer>);
+
+impl CollaborationHub for ChannelBufferCollaborationHub {
+    fn collaborators<'a>(&self, cx: &'a AppContext) -> &'a HashMap<PeerId, Collaborator> {
+        self.0.read(cx).collaborators()
+    }
+
+    fn user_participant_indices<'a>(
+        &self,
+        cx: &'a AppContext,
+    ) -> &'a HashMap<u64, ParticipantIndex> {
+        self.0.read(cx).user_store().read(cx).participant_indices()
+    }
+}

crates/collab_ui2/src/collab_panel.rs 🔗

@@ -191,6 +191,7 @@ use workspace::{
     Workspace,
 };
 
+use crate::channel_view::ChannelView;
 use crate::{face_pile::FacePile, CollaborationPanelSettings};
 
 use self::channel_modal::ChannelModal;
@@ -1935,8 +1936,7 @@ impl CollabPanel {
 
     fn open_channel_notes(&mut self, channel_id: ChannelId, cx: &mut ViewContext<Self>) {
         if let Some(workspace) = self.workspace.upgrade() {
-            todo!();
-            // ChannelView::open(action.channel_id, workspace, cx).detach();
+            ChannelView::open(channel_id, workspace, cx).detach();
         }
     }
 
@@ -2619,6 +2619,9 @@ impl CollabPanel {
                                                     } else {
                                                         Color::Muted
                                                     })
+                                                    .on_click(cx.listener(move |this, _, cx| {
+                                                        this.open_channel_notes(channel_id, cx)
+                                                    }))
                                                     .tooltip(|cx| {
                                                         Tooltip::text("Open channel notes", cx)
                                                     }),

crates/collab_ui2/src/collab_ui.rs 🔗

@@ -33,6 +33,7 @@ pub fn init(app_state: &Arc<AppState>, cx: &mut AppContext) {
     // vcs_menu::init(cx);
     collab_titlebar_item::init(cx);
     collab_panel::init(cx);
+    channel_view::init(cx);
     // chat_panel::init(cx);
     notifications::init(&app_state, cx);
 

crates/gpui2/src/app/test_context.rs 🔗

@@ -545,6 +545,10 @@ pub struct VisualTestContext<'a> {
 }
 
 impl<'a> VisualTestContext<'a> {
+    pub fn update<R>(&mut self, f: impl FnOnce(&mut WindowContext) -> R) -> R {
+        self.cx.update_window(self.window, |_, cx| f(cx)).unwrap()
+    }
+
     pub fn from_window(window: AnyWindowHandle, cx: &'a mut TestAppContext) -> Self {
         Self { cx, window }
     }

crates/workspace2/src/workspace2.rs 🔗

@@ -2077,6 +2077,7 @@ impl Workspace {
                 }
                 if &pane == self.active_pane() {
                     self.active_item_path_changed(cx);
+                    self.update_active_view_for_followers(cx);
                 }
             }
             pane::Event::ChangeItemTitle => {
@@ -2756,18 +2757,18 @@ impl Workspace {
     fn update_active_view_for_followers(&mut self, cx: &mut ViewContext<Self>) {
         let mut is_project_item = true;
         let mut update = proto::UpdateActiveView::default();
-        if self.active_pane.read(cx).has_focus(cx) {
-            let item = self
-                .active_item(cx)
-                .and_then(|item| item.to_followable_item_handle(cx));
-            if let Some(item) = item {
-                is_project_item = item.is_project_item(cx);
-                update = proto::UpdateActiveView {
-                    id: item
-                        .remote_id(&self.app_state.client, cx)
-                        .map(|id| id.to_proto()),
-                    leader_id: self.leader_for_pane(&self.active_pane),
-                };
+
+        if let Some(item) = self.active_item(cx) {
+            if item.focus_handle(cx).contains_focused(cx) {
+                if let Some(item) = item.to_followable_item_handle(cx) {
+                    is_project_item = item.is_project_item(cx);
+                    update = proto::UpdateActiveView {
+                        id: item
+                            .remote_id(&self.app_state.client, cx)
+                            .map(|id| id.to_proto()),
+                        leader_id: self.leader_for_pane(&self.active_pane),
+                    };
+                }
             }
         }