From 0e2ce490656687ac1dce16fd581898517cf0534f Mon Sep 17 00:00:00 2001
From: Dong <dong.chen@linecorp.com>
Date: Mon, 16 Mar 2026 21:45:58 +0800
Subject: [PATCH] markdown_preview: Fix not re-rendering issue when editing by
 agent (#50583)

Closes #47900

## Root cause

The current markdown preview only re-renders on `EditorEvent::Edited,
DirtyChanged, ExcerptsEdited`, but agent edits are implemented via
[`buffer.edit()`](https://github.com/dongdong867/zed/blob/eb3f92708b6dc67bb534c1c44a200c0cb5c4997b/crates/agent/src/edit_agent.rs#L375)
which does not guaranty to emit the `EditorEvent::Edited` event. Causing
the markdown preview stuck on the last received parsed markdown.

## Applied fix

Subscribing to `EditorEvent::BufferEdited` when initializing the
markdown preview view. This will cause the view to update when received
`BufferEdited` event including agent edits to the file.

## As is/ To be

As is | To be
--- | ---
<video
src="https://github.com/user-attachments/assets/a0b13467-7758-4572-ae01-bcbc40beff6c"
/> | <video
src="https://github.com/user-attachments/assets/3b5463f3-46ad-4fe6-8563-ceb4347035db"
/>

---

Before you mark this PR as ready for review, make sure that you have:
- [x] Added a solid test coverage and/or screenshots from doing manual
testing
- [x] Done a self-review taking into account security and performance
aspects
- [ ] Aligned any UI changes with the [UI
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)

Release Notes:

- Fixed markdown preview not re-rendering when edited by agent
---
 crates/markdown_preview/src/markdown_preview_view.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/crates/markdown_preview/src/markdown_preview_view.rs b/crates/markdown_preview/src/markdown_preview_view.rs
index d6e4a78fd8a5366bb05ad88dcd95cc822eb86629..7cf4cd844548ba9a67cd660c3b296f48e11d2937 100644
--- a/crates/markdown_preview/src/markdown_preview_view.rs
+++ b/crates/markdown_preview/src/markdown_preview_view.rs
@@ -277,6 +277,7 @@ impl MarkdownPreviewView {
             |this, editor, event: &EditorEvent, window, cx| {
                 match event {
                     EditorEvent::Edited { .. }
+                    | EditorEvent::BufferEdited { .. }
                     | EditorEvent::DirtyChanged
                     | EditorEvent::ExcerptsEdited { .. } => {
                         this.parse_markdown_from_active_editor(true, window, cx);