[Webkit-unassigned] [Bug 215643] New: Arabic requires zero-width-joiners for joining

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=215643

            Bug ID: 215643
           Summary: Arabic requires zero-width-joiners for joining
           Product: WebKit
           Version: Safari 13
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML Editing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: hosskhalifa at gmail.com
                CC: wenson_hsieh at apple.com

Created attachment 406834

  --> https://bugs.webkit.org/attachment.cgi?id=406834&action=review

not working on safari

UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.117 Safari/537.36


Steps to reproduce the problem:
Place HTML tags within an Arabic word.

What is the expected behavior?
The letters of the word should be joined.

What went wrong?
The letters of the word are separate; adding ZWJs is necessary to join them. Even adding ZWJs isn't a full resolution, as ligatures aren't used then.

Does it occur on multiple sites: Yes

Is it a problem with a plugin? No 

Did this work before? No 

Does this work in other browsers? Yes

OS Version: OS X 10.13.3

Here's a small discussion on this issue: https://twitter.com/KhaledGhetas/status/989311667682119681

Adding ZWJs per se isn't an an issue, but:
 - it's much easier to not add them
 - adding them doesn't render ligatures properly, like ألا
 - Firefox (and Edge, reportedly) don't need them.

Coloring parts of Arabic words is a often needed feature, like highlighting matches, adding tajweed coloring to the Qur'an (open muqri.com, click play, and click on the ت), and so on.

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