markdown preview: Update channel notes when other collaborator changes buffer (#10718)

Bennet Bo Fenner created 

https://github.com/zed-industries/zed/assets/53836821/9a57885e-83b0-49fb-b3a8-0a7868566b85


Release Notes:

- Markdown preview now re-renders when another collaborator changes the
content of channel notes

Change summary

crates/collab_ui/src/channel_view.rs | 4 ++++
1 file changed, 4 insertions(+)

Detailed changes

crates/collab_ui/src/channel_view.rs 🔗 

@@ -305,6 +305,10 @@ impl ChannelView {
                 });
             }
             ChannelBufferEvent::BufferEdited => {
+                // Emit the edited event on the editor context so that other views can update it's state (e.g. markdown preview)
+                self.editor.update(cx, |_, cx| {
+                    cx.emit(EditorEvent::Edited);
+                });
                 if self.editor.read(cx).is_focused(cx) {
                     self.acknowledge_buffer_version(cx);
                 } else {