[beforeInput] Starting composition on a fake caret scrolls the screen to nowhere

[Reinmar]

📝 Provide detailed reproduction steps (if any)

On the feature branch from #11438:

1. Put selection on a table/image/widget and press left arrow key
2. Type "k" using a Hiragana keyboard.

✔️ Expected result

Works as with a non-composing keyword.

❌ Actual result

The viewport scrolls to the bottom.

❓ Possible solution

The problem was discussed in https://github.com/ckeditor/ckeditor5/pull/12024/files#r923476948.

Apparently, for this combination of OS+browser it's too late to move selection on compositionstart. Before beforeInput-related changes we've done that on keydown.

📃 Other details

• Browser: Chrome
• OS: macOS

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[Acrophost]

Possible duplicate of #11776

[CKEditorBot]

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[CKEditorBot]

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