Pressing backspace duplicates the content when using Korean input on Android

[FilipTokarski]

📝 Provide detailed reproduction steps (if any)

1. Use Android device with Swift keyboard and Korean keyboard (no Latin characters)
2. Press any Korean character and create a composition from autosuggestion
3. Try pressing backspace a few times

✔️ Expected result

Backspace works, characters get deleted.

❌ Actual result

The content gets duplicated each time you press backspace. Also the first character gets duplicated and stays at the beginning of the paragraph.

Screencast

Works ok in raw contenteditable, compare on the recording:

https://user-images.githubusercontent.com/34380544/168558485-02b7fdba-9930-4ead-8f19-10e978ab06a2.mov

📃 Other details

• Browser: Chrome Android
• OS: Android 10
• Keyboard: Swift
• Branch: ck/11438-beforeinput-ime-research-vol1.1 commit c0e2a2ed7

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[FilipTokarski]

Fun fact - Korean composition works fine for example in link balloon input.

[Acrophost]

Issue is no longer reproducible on branch ck/11438-beforeinput-ime-research-vol1.1-android

[CKEditorBot]

There has been no activity on this issue for the past year. We've marked it as stale and will close it in 30 days. We understand it may be relevant, so if you're interested in the solution, leave a comment or reaction under this issue.

[CKEditorBot]

We've closed your issue due to inactivity over the last year. We understand that the issue may still be relevant. If so, feel free to open a new one (and link this issue to it).