[IME] Typing after multiple spaces breaks the composition

[farthinker]

📝 Provide detailed reproduction steps (if any)

1. Start typing in an empty paragraph
2. Type several characters, 'abc' for example, and then insert more than 2 spaces.
3. Start typing with Chinese IME

This issue might be related to #5877

✔️ Expected result

Correctly insert Chinese words.

❌ Actual result

Composition breaks.

📃 Other details

• Browser: Chrome 78.0.3904.108
• OS: Mac OS 10.15.1
• CKEditor version: CKEditor5 v15.0.0
• Installed CKEditor plugins: nothing special

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[Mgsy]

I can confirm this issue.

[LukaszGudel]

Current state of this issue:

• works correctly on Safari
• in Chrome bugged just like in the gif above
• in Firefox works correctly if there is odd number of spaces and breaks composition if there is even number of spaces

Firefox:

[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).