203536 - Math characters like ∀ display inconsistently with XFT

Status: RESOLVED DUPLICATE of bug 128153

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

Description

[Jason McCarty]

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.3) Gecko/20030327 Debian/1.3-4
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.3) Gecko/20030327 Debian/1.3-4

Lines of text with some math characters in the listed page either render as
garbage, or cause surrounding characters to disappear. Characters that cause the
problem include ∀, 2203, and 2208, which are the forall, exists, and set
membership math characters. Specifically, those characters are rendered garbled,
then if I highlight them, they are rendered correctly, but the left square
brackets near them disappear and reappear depending on where the selection
extends to.


Reproducible: Always

Steps to Reproduce:
1. View the page at the above URL.
2. In the first inset quote on that page, some of the math characters are garbled.
3. Highlighting the characters makes some of them appear or disappear.

Comment 1

[Boris Zbarsky [:bzbarsky]]

Jason, are you using an xft build or a regular one?

Comment 2

[Jason McCarty]

I'm using xft, via Debian's mozilla-xft package. I just checked, and it looks
like the problem doesn't occur without xft support enabled.

Comment 3

[Boris Zbarsky [:bzbarsky]]

Thanks for checking.  ;)

Over to blizzard.

Comment 4

[Christian :Biesinger (don't email me, ping me on IRC)]

sounds like a duplicate of bug 128153

Comment 5

[Jason McCarty]

Attachment: image of problem

Well, this could be the same bug, but I'm seeing character corruption instead
of misplacement. In the attached file, the top part shows the initial
rendering, the middle shows what happens if I highlight and unhighlight the
text (a change in focus also causes it), and the bottom image shows what
happens when I highlight a certain space. This is all of that first inset
quote.
I also noticed that the math characters don't have antialising like the
characters around them do.

Comment 6

[Christopher Blizzard (:blizzard)]

dup

*** This bug has been marked as a duplicate of 128153 ***