[FF][IME] First character is not inserted after using spanish accent + Bold.

[f1ames]

1. Go to http://localhost:8125/ckeditor5-typing/tests/manual/input.html.
2. Type Spanish accent '.
3. Press Bold.
4. Type more characters.

First character after using Bold (3.) is not inserted.

[f1ames]

The previous scenario is fixed. However, after Cmd + b (instead of using Bold button) next typed character is not bolded.

[f1ames]

The previous scenario is fixed. However, after Cmd + b (instead of using Bold button) next typed character is not bolded.

Just to clarify one thing for future reference: the reason why the next character is not bolded is that the Cmd/Ctrl + B does not activates bold if used during composition. It only ends composition (and for Hiragana it does nothing). It works same way in current implementation and native contenteditable, so I suppose it should not be considered as a bug.