Bug: Chinese IME punctuation duplicates in v1.101 when Vim extension is active

[muyiGin]

Does this issue occur when all extensions are disabled?: No

This issue appears to be a regression in VS Code itself, not an issue with the Vim extension alone.

Troubleshooting summary:
I have performed extensive testing. I've reinstalled VS Code completely multiple times and tested the Vim extension in isolation.

The key finding is: The bug only appears in recent VS Code builds (e.g., May 2025, v1.101). When I downgrade VS Code to the March 2025 version, the problem completely disappears, even while using the same latest version of the Vim extension.

This strongly suggests a breaking change was introduced within VS Code's core between the March and May versions that affects how it handles IME events when the Vim extension is active.

• VS Code Version: 1.101.0 (May 2025)
• OS Version: Windows 11 (on AMD R9 CPU)

Steps to Reproduce:

1. Use VS Code version 1.101.0.
2. Ensure the VSCodeVim extension is enabled.
3. Open any file in the editor.
4. Press i to enter Vim's Insert Mode.
5. Switch the system's input method to any Chinese IME.
6. Type a full-width punctuation mark, such as a comma ， or a period 。.

Actual Behavior:
The punctuation mark is immediately duplicated (e.g., ， becomes ，，).

Expected Behavior:
Only a single punctuation mark should be inserted (e.g., ， should remain ，).

[wrsz01]

应该是vscode的问题，vim降级也无法解决。

[hangter-lt]

不止是标点符号,insert模式下输入中文就会重复字符,并且覆盖部分内容.降级VScode版本后才可以.

[BeDay]

experimentalEditContextEnabled 在设置中把这个关了，可以解决
https://code.visualstudio.com/updates/v1_101#_edit-context
#251518

[tamuratak]

cc: @aiday-mar