ASCII characters should not be part of the editing undo/redo stack

[rebornix]

Testing #229383

• Use Chinese IME on macOS
• Put cursor in the middle of a document
• Type nihao, press space to accept
• With textarea, undo once, all Chinese characters are removed
• 🐛 With EditContext, undo once, Chinese characters are replaced with nihao, and you can continue to undo each ASCII

Textarea

Screen.Recording.2024-09-24.at.11.57.40.AM.mov

EditContext

Screen.Recording.2024-09-24.at.11.57.06.AM.mov

[aiday-mar]

I was able to reproduce, strangely this happens sometimes and other times, Control+Z removes the whole word.
For me it also seems to happen mostly when I type really slowly. If I type ni hao quickly, this does not happen.

After some more investigation I noticed this happens both with the setting and without.