Android Chinese Input Issue: Backspace requires two presses to trigger one onChange event

[XXPermanentXX]

Description
When using a Chinese Input Method Editor (IME) on Android devices, pressing the backspace/delete key requires two presses to trigger a single onChange event. This means users need to tap delete twice to actually delete once.

This issue occurs:

• On any Android device
• In any browser (Chrome, Firefox, Samsung Internet, etc.)
• With any Chinese IME (Gboard Chinese, Sogou, Baidu, etc.)
• With the simplest possible Slate setup (no custom plugins)

The issue does NOT occur:

• On iOS devices
• On desktop browsers
• When using English keyboard on Android (in some cases)

Recording
https://github.com/user-attachments/assets/208ed8df-cc72-4339-ad1e-d4867891f9db

Steps
To reproduce the behavior:

1. Open the Slate editor on an Android device
2. Switch to a Chinese IME (e.g., Gboard Chinese)
3. Type some text (e.g., "12345")
4. Press the backspace/delete key
5. Observe that onChange is not triggered on the first press
6. Press backspace again
7. Now onChange is triggered, and two characters are deleted at once (e.g., "123")

Expectation
Each backspace press should:

1. Delete exactly one character
2. Trigger one onChange event immediately
   This is how other editors (Google Docs, Notion, Medium) handle backspace on Android Chinese IME.

Environment

• Slate Version: 120.0
• Operating System: Android 14
• Code：

const PlainTextExample = () => {
    const editor = useMemo(() => withReact(createEditor()), []);
    return (
      <Slate editor={editor} initialValue={initialValue} onChange={(value) => {
        console.log('=======PlainTextExample onValueChange', CreationPromptModel.descendantToString(value));
      }}>
        <Editable placeholder="Enter some plain text..." />
      </Slate>
    )
  }
  
  const initialValue: Descendant[] = [
    {
      type: 'paragraph',
      children: [
        { text: 'This is editable plain text, just like a <textarea>!' },
      ],
    },
  ]

  export default PlainTextExample

[wljray]

Bug Scene:

Under a Chinese input method, after typing some Chinese characters (directly pressing Backspace without typing is fine; the issue only occurs after typing), the first Backspace doesn't trigger onChange, but the second triggers it twice in a row.

Solution

Below is the corresponding PR link. https://github.com/ianstormtaylor/slate/pull/5985

Need Review

I used AI to help pinpoint the root cause, and it successfully identified the issue.

However, since the fix was generated by AI, it requires review and impact assessment by the official team.