Streamline Markdown notification rendering (#48162)

Nicolas Le Cam created 2 months ago

Brought the Markdown notification rendering up to date with how Markdown
is used in the Agent panel and REPL.
Removed async parsing overhead and simplified the code by using the
markdown crate API directly.

This is preparatory work, my ultimate goal is to make markdown_preview
use markdown to parse and render md to [fix not being able to select and
copy content](https://github.com/zed-industries/zed/issues/16727)

|Current|Now|
|-|-|
|<img width="469" height="258" alt="Capture d’écran du 2026-02-01
22-39-39"
src="https://github.com/user-attachments/assets/6e416b9d-aef8-4202-b3ce-8c22602d0fbd"
/>|<img width="458" height="200" alt="Capture d’écran du 2026-02-01
22-37-16"
src="https://github.com/user-attachments/assets/bd590f17-0448-4cbc-a6df-9aecfa0754e8"
/>|

Release Notes:

- N/A

Change summary

crates/zed/src/zed.rs | 57 +++++++++++++++------------------------------
1 file changed, 19 insertions(+), 38 deletions(-)

Detailed changes

crates/zed/src/zed.rs

@@ -43,6 +43,7 @@ use language::Capability;
 use language_onboarding::BasedPyrightBanner;
 use language_tools::lsp_button::{self, LspButton};
 use language_tools::lsp_log_view::LspLogToolbarItemView;
+use markdown::{Markdown, MarkdownElement, MarkdownFont, MarkdownStyle};
 use migrate::{MigrationBanner, MigrationEvent, MigrationNotification, MigrationType};
 use migrator::migrate_keymap;
 use onboarding::DOCS_URL;
@@ -1759,48 +1760,28 @@ fn show_markdown_app_notification<F>(
 ) where
     F: 'static + Send + Sync + Fn(&mut Window, &mut Context<MessageNotification>),
 {
-    let parsed_markdown = cx.background_spawn(async move {
-        let file_location_directory = None;
-        let language_registry = None;
-        markdown_preview::markdown_parser::parse_markdown(
-            &message.0,
-            file_location_directory,
-            language_registry,
-        )
-        .await
-    });
+    let markdown = cx.new(|cx| Markdown::new(message.0.into(), None, None, cx));
+    let primary_button_on_click = Arc::new(primary_button_on_click);
 
-    cx.spawn(async move |cx| {
-        let parsed_markdown = Arc::new(parsed_markdown.await);
+    show_app_notification(notification_id, cx, move |cx| {
+        let markdown = markdown.clone();
         let primary_button_message = primary_button_message.clone();
-        let primary_button_on_click = Arc::new(primary_button_on_click);
-        cx.update(|cx| {
-            show_app_notification(notification_id, cx, move |cx| {
-                let workspace_handle = cx.entity().downgrade();
-                let parsed_markdown = parsed_markdown.clone();
-                let primary_button_message = primary_button_message.clone();
-                let primary_button_on_click = primary_button_on_click.clone();
-                cx.new(move |cx| {
-                    MessageNotification::new_from_builder(cx, move |window, cx| {
-                        image_cache(retain_all("notification-cache"))
-                            .child(div().text_ui(cx).child(
-                                markdown_preview::markdown_renderer::render_parsed_markdown(
-                                    &parsed_markdown.clone(),
-                                    Some(workspace_handle.clone()),
-                                    window,
-                                    cx,
-                                ),
-                            ))
-                            .into_any()
-                    })
-                    .primary_message(primary_button_message)
-                    .primary_icon(IconName::Settings)
-                    .primary_on_click_arc(primary_button_on_click)
-                })
+        let primary_button_on_click = primary_button_on_click.clone();
+
+        cx.new(move |cx| {
+            MessageNotification::new_from_builder(cx, move |window, cx| {
+                image_cache(retain_all("notification-cache"))
+                    .child(div().text_ui(cx).child(MarkdownElement::new(
+                        markdown.clone(),
+                        MarkdownStyle::themed(MarkdownFont::Editor, window, cx),
+                    )))
+                    .into_any()
             })
-        });
+            .primary_message(primary_button_message)
+            .primary_icon(IconName::Settings)
+            .primary_on_click_arc(primary_button_on_click)
+        })
     })
-    .detach();
 }
 
 fn reload_keymaps(cx: &mut App, mut user_key_bindings: Vec<KeyBinding>) {