[Webkit-unassigned] [Bug 15066] New: Thai vowels and tone marks displayed incorrectly on Leopard 9A499

[bugzilla-daemon at webkit.org]

http://bugs.webkit.org/show_bug.cgi?id=15066

           Summary: Thai vowels and tone marks displayed incorrectly on
                    Leopard 9A499
           Product: WebKit
           Version: 522+ (nightly)
          Platform: Macintosh Intel
               URL: https://bugzilla.mozilla.org/attachment.cgi?id=277665
        OS/Version: Mac OS X 10.5
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: jdaggett at mozilla.com


Depending on the font, Thai vowel marks appear before the character they should
be combined with.

Steps:

1. Install latest Leopard dev release build (9A499)
2. Open URL
3. Click on the "Display" button

Result: a table appears listing Devanagari, Arabic and Thai with different
fonts set.  Scroll down to the Thai font "Ayuthaya".  The first glyph in the
string of Thai characters is a vowel mark, it should be rendered above the next
character.  Same for some font substitution cases, Andale Mono, Courier,
Monaco.

For more background:

https://bugzilla.mozilla.org/show_bug.cgi?id=392209

Seems like the way ATSUI does font substitution has changed in 10.5.

Confirmed with Webkit nightly r25168.


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