[IME][Chrome][Safari] Composing on the end of the link breaks composition

[f1ames]

Is this a bug report or feature request? (choose one)

🐞 Bug report

💻 Version of CKEditor

CKEditor 5 (v10.0.1)

📋 Steps to reproduce case 1

1. Go to https://ckeditor5.github.io.
2. Place selection on the end of any link.
3. Switch to Spanish keyboard.
4. Press Spanish accent character '.
5. Press a.

✅ Expected result

Accented character is properly inserted (and is part of a link).

❎ Actual result

Accented character is not inserted. Instead a is inserted.

Chrome:

Safari:

📋 Steps to reproduce case 2

Extracted from #3088 (see https://github.com/ckeditor/ckeditor5-typing/issues/95#issuecomment-393084080).

1. Go to https://ckeditor5.github.io.
2. Place selection on the end of any link.
3. Switch to Japanese Hiragana keyboard.
4. Press a few times.
5. Navigate with up/down arrow keys through IME panel.

✅ Expected result

It is possible to navigate through IME panel without any effect on editors' content.

❎ Actual result

Chrome: Each time you navigate through IME panel new characters are inserted.
Safari: IME panel is not opened at all so it is not possible to compose anything.

Chrome:

📃 Other details that might be useful

Happens only in Safari (11.0.3 (13604.5.6)) and Chrome (66.0.3359.181 (Official Build) (64-bit)), Firefox works fine.

Extracted from #3088 (see https://github.com/ckeditor/ckeditor5-typing/issues/95#issuecomment-393084080). I believe the cause is same or very similar in those two cases which was the main reason I put them as a one issue.
I think it might be fixed with the first inline fillers improvement - https://github.com/ckeditor/ckeditor5-engine/issues/1342).

[cai123nb]

Any progress?

[Mgsy]

Another case:

Steps to reproduce

1. Turn on Chinese (Pinyin - simplified).
2. At the end of the link type "shisshishhi".

Current result

Can't convert the text.

[LukaszGudel]

Current state of this issue:

• Case 1: Same result.
• Case 2:
  • Firefox: works correctly.
  • Chrome: is not opening suggestions window and can not convert the text.
  • Safari: there is an issue with duplicating typed characters. Typing abcdef results in a ab abc abcd abcde abcdef

[aletorrado]

Hi, this is still broken in v35. Is there any plan to address this issue? Is any diagnosis made so far at least? Thanks