543782 - Apple LiGothic rendering failure when encounter specific characters on textbox

Status: RESOLVED WONTFIX

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

Description

[Irvin (MozTW)]

User-Agent:       Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; zh-TW; rv:1.9.2) Gecko/20100115 Firefox/3.6 GTB6
Build Identifier: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; zh-TW; rv:1.9.2) Gecko/20100115 Firefox/3.6 GTB6

Similar to Bug 532346, on Mac OS X 10.6, when firefox encounter "睛" as the first character in any textbox, including url, search box and textbox in webpages, the letter will overlaps following characters. 

This bug happened with Apple LiGothic, the default trad. chinese font of firefox on mac os x.

Reproducible: Always

Steps to Reproduce:
1. Type or copying "眼睛12345" on url box, search box on firefox UI, or textbox on any pages, it display correct.
2. Delete the first characer "眼", "睛" will also disapper.

* If you try to type or paste "睛" to any textbox, it can't be shown.

Comment 1

[Irvin (MozTW)]

Attachment: When "睛" as second chatacter, it display correct without problem

Comment 2

[Irvin (MozTW)]

Attachment: "睛" broke when it on the first character

Comment 3

[Irvin (MozTW)]

Attachment: the letter also overlaps on textbox

Comment 4

[Irvin (MozTW)]

The bug also apply to Firefox 3.5.* & prism 1.0b2

Comment 5

[Hsiao-Ting Yu (Littlebtc)]

I can reproduce the bug too, on Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; zh-TW; rv:1.9.2) Gecko/20100115 Firefox/3.6. Is there anyone to confirm it?

Comment 6

[Jonathan Kew [:jfkthame]]

I just downloaded the Firefox 3.6 zh-TW release but was not able to reproduce this issue (on Mac OS X 10.6.2). Puzzled....

Comment 7

[Tim Guan-tin Chien [:timdream] (please needinfo)]

Irvin,

Does this has something to do with TCFail?
Textboxes and UI default font could be changed by it right?

Maybe we should make something like attachment 415587 [details] but use <input> instead of <span>.

Comment 8

[Tim Guan-tin Chien [:timdream] (please needinfo)]

Attachment: testcase: <input> textboxes with different font

Comment 9

[Irvin (MozTW)]

(In reply to comment #7)
> Irvin,
> 
> Does this has something to do with TCFail?
> Textboxes and UI default font could be changed by it right?
TCFail doesn't affect Firefox at all, with default settings Firefox 3.6 (zh-tw) used Apple LiGothic on URL & Search toolbox wether what system font is. 

The <input> textboxes testcase https://bugzilla.mozilla.org/attachment.cgi?id=427943 display normally.

Firefox 3.6 newly profile on OS X 10.6.2

Comment 10

[Irvin (MozTW)]

Attachment: testcase: <input> textboxes with different font

Comment 11

[Irvin (MozTW)]

Attachment: Screenshot with rendering error on last input box on testcase (427954)

Comment 12

[Tim Guan-tin Chien [:timdream] (please needinfo)]

Comment on attachment 427943 [details]
testcase: <input> textboxes with different font

See attachment 427954 [details]; It seems the only way to trigger the bug is specifying nothing - no font-family, no lang property, nothing.

Screenshot and XUL testcase to come. Thanks Irvin and Shiao-Ting.

Comment 13

[Irvin (MozTW)]

I'd tried the following 2 tests, and confirm that nothing to do with this bug, the result of the testcase are all the same, "睛" display wrong on the last one - specifying nothing.

1. Modify the OS X system default fallback font ( /System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreText.framework/Resources/DefaultFontFallbacks.plist ) on zh-hant to other fonts than Heiti TC or Apple LiGothic, ex. STXihei

2. Set the OS X Language to English instead of zh-hant

Comment 14

[Irvin (MozTW)]

As OS X default zh-tw font had been changed for years, I think we can close this bug.