499566 - When editing, Persian and Arabic text is rendered disconnected

Status: RESOLVED DUPLICATE of bug 499538

(Firefox :: General, defect)

Description

[Amir Reza Khosroshahi]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1) Gecko/20090616 Firefox/3.5 (.NET CLR 3.5.30729)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1) Gecko/20090616 Firefox/3.5 (.NET CLR 3.5.30729)

When editing Persian or Arabic text in a text box, sometimes the text is rendered disconnected-- that is, letters that should appear connected and in their presentation form, are rendered and displayed disconnected and in their separate form.

It is not clear that exactly when this happens. But it can usually be reproduced by pressing the 'Home' key and starting to type, after having typed several words.

An example is given in Steps to Reproduce, and a screen-shot is also given.

As far as I remember, this bug was not present prior to Firefox 3.5, and this should be a new bug introduced in this version.



Reproducible: Always

Steps to Reproduce:
1. Take focus to any text box for typing (e.g. the Firefox search box)
2. Type these two Persian words: نمایش متن
3. Press 'Home' to take the cursor to the beginning of the text
4. Start typing this word: مشکل
5. While typing you can see the letters getting disconnected.

Actual Results:  
Letters that should be rendered as connected got disconnected.
Of course, the real text data is untouched, i.e. characters passed as data are correct. Only the appearance (according to Persian/Arabic script rules) are incorrect.