Bug 15066 – Thai vowels and tone marks displayed incorrectly on Leopard 9A499

• Component: Layout and Rendering
• Status: RESOLVED INVALID

[John Daggett]

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.

[John Daggett]

Created attachment 16105 [details]
testcase screenshot

[David Kilzer (:ddkilzer)]

<rdar://problem/5435331>

[David Kilzer (:ddkilzer)]

Thanks for the bug report, John!  However, this bug should have been filed in Radar at <http://bugreport.apple.com/> at not in WebKit Bugzilla for two reasons:

1. It is not a bug in WebKit.
2. The bug is in a developer release of software covered by an NDA.

I have created a Radar for this, and will now close this bug as RESOLVED/INVALID for the above reasons.

Note that you may use <http://connect.apple.com/> to create a free "online" account for use with bugreport.apple.com.