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Placeholder of an empty list item stays visible on a collaborator's editor using Firefox after text is typed by another user using Chromium

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評估

難度
4/5
預估耗時
3-5 天
新手友好度
58/100
Issue 類型
缺陷
描述清晰度
基本清楚
活躍度
活躍
技術堆疊
react, typescript
領域
frontend

研究方向

Start by tracing how the empty-block placeholder is recalculated when local typing changes a list item, then compare that with the remote Yjs update path in the editor. Reproduce with Firefox and Chromium on the demo; test whether the fix also handles typing in the reverse direction and other block types. Done when the placeholder disappears in Firefox after remote text arrives, without breaking local typing.

由索引模型根據 Issue 內容生成。

描述

What's broken?

In a collaborative session, the gray placeholder of a list item doesn't go away in Firefox when the other user types in that item from Chromium. The block's text syncs correctly, but the "List" placeholder stays visible right after the text.

It happens on every new bullet item the Chromium user creates and types into. In the Chromium editor everything looks right: no placeholder once there's text.

Reproduced on the official demo: https://www.blocknotejs.org/demo

What did you expect to happen?

When a block that was empty gets content from a remote collaborator, its placeholder should go away on every client, the same as it does for local typing.

Steps to reproduce
  1. Open https://www.blocknotejs.org/demo in Firefox and copy the collaboration URL (/demo#<room>).
  2. Open the same URL in Chromium / Chrome.
  3. In Chromium, put the cursor at the end of a bullet list item and press Enter to create a new, empty bullet item.
  4. In Firefox, the new empty item shows the "List" placeholder, as expected.
  5. In Chromium, type some text into that new item.
  6. In Firefox: the text shows up, but the gray "List" placeholder stays visible after it.
  7. Repeat with another new item and you get the same result.
What browsers are you seeing the problem on?
  • Firefox: the editor where the stale placeholder appears
  • Chromium: the editor where the user types
BlockNote version

The version deployed on blocknotejs.org/demo as of 2026-10-23

Environment

Linux (Ubuntu), Firefox and Chromium side by side on the same machine

Additional context

See the attached video: Firefox on the left, Chromium on the right.

It looks like the empty-block placeholder decoration isn't recalculated on the Firefox client when the block's content comes from a remote Yjs update rather than a local transaction. It may be tied to where the Firefox selection sits, since its caret is in or near that block. This is only a guess and hasn't been checked in the code. We haven't tested the reverse case (typing in Firefox, watching in Chromium) or other block types (paragraph, numbered list, checklist), which could help narrow it down.

https://github.com/user-attachments/assets/2bb0640d-219d-4f24-92f8-1736ea075e55

主要語言
TypeScript
星號
10.3k
分支
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平均合併
2 天 22 小時
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