501315 - Arabic text in textboxes randomly becomes unjoined

Status: VERIFIED DUPLICATE of bug 499538

(Core :: Layout: Text and Fonts, defect)

Description

[Khaled Hosny]

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; ar; rv:1.9.1) Gecko/20090624 Firefox/3.5
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; ar; rv:1.9.1) Gecko/20090624 Firefox/3.5

Occasionally, when editing text lines containing mixed Arabic/English text, the Arabic text comes as separate unjoined letters. 

Reproducible: Sometimes

Steps to Reproduce:
1. Type an English string in any textbox
2. Type an Arabic string inside the English one
3. 
Actual Results:  
Arabic will come as separated letters

Expected Results:  
Arabic should be joined

Cutting and pasting that text will cause the Arabic text to get joined again. This has been probably introduced in 3.5 rc2 or rc1, it didn't happen in betas nor it did in earlier Firefox releases.

Comment 1

[Khaled Hosny]

Attachment: Screenshot

The first line shows the broken text, the second line is the exact same line copied & pasted and the Arabic text is not broken.

Comment 2

[(no longer active)]

I have observed this on Windows as well, but couldn't file a bug because of bad Internet connection.  I have observed this when editing fully Persian text as well, but don't have a separate steps to reproduce for that case on hand.

Confirming and moving to Layout Text.  This is a serious regression and we should probably fix it in a dot release (since 1.9.1 can't probably be targeted at this stage.)

Comment 3

[(no longer active)]

CCing Simon and Roc who might have ideas on how to fix this, and also Henrik and Marcia who may be able to help with finding a regression range.