Incorrect backspace behaviour for Arabic Text

[kubaklatt]

📝 Provide detailed reproduction steps (if any)

1. Open for example RTL demo and type أهلاً وسهلاً
2. Press backspace

✔️ Expected result

After using backspace we should get أهلاً وسهلا

❌ Actual result

After using backspace we get أهلاً وسهل

📃 Other details

I checked how it looks in a contenteditable div and it works properly there.

• Browser: Chrome (Version 131.0.6778.265)
• OS: macOS Sequoia 15.2
• First affected CKEditor version: …
• Installed CKEditor plugins: …

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[Witoso]

@kubaklatt please share what browser, device, what keyboard (if Android mobile), etc. We need this information because Arabic is composed.

[kubaklatt]

@Witoso the problem is only reproducible on Chrome. I checked also on Safari, Firefox, and Safari on iOS and it works correctly there.

[HalanaSMD]

Currently I am working on a project, and the project owner wants to use Ckeditor on Chrome precisely.
I tried switching to Firefox and it worked fine. But this issue needs to be solved on other browsers especially Chrome. I hope this issue get fixed as soon as possible.

[Witoso]

@HalanaSMD could we get the typing characters sequence (one by one) on the QWERTY-like keyboard?

@niegowski I remember there was some difference how we delete such characters vs CKEditor 4, but I may be confusing something here.

[HalanaSMD]

@Witoso ckeditor handles this already.
Ckeditor has two options for deleting letter, One is by Character and the other by CodePoint (for characters containing combining marks based on Unciode).
But I think the problem that makes the backspace button to not function properly on some browsers could be the TargetRange.

[Witoso]

Thanks, could you provide a typing sequence (any) we can use for tests?