425338 - hovering over text on wikipedia causes jiggling text

Status: VERIFIED FIXED

(Core :: Layout: Text and Fonts, defect, P1)

Description

[John Daggett (:jtd)]

Steps:

1. Go to wikipedia
2. Move the mouse over the list of languages listed under 10,000+

Result: the layout of the line suddenly switches back and forth between two states.  Occurs over multiple lines, starting with the language after Azərbaycan in the list.

Comment 1

[John Daggett (:jtd)]

Attachment: testcase, reduced with all styles included

Comment 2

[Gary Kwong [:gkw] [:nth10sd] (NOT official MoCo now)]

Attachment: better testcase

Here's a simplified testcase.

Comment 3

[Gary Kwong [:gkw] [:nth10sd] (NOT official MoCo now)]

some things of note, re: my testcase

- remove the line "a {	text-decoration: none; }" and the issue doesn't occur.
- remove the line "a:hover { text-decoration: underline; }" and the issue doesn't occur.
- remove the tag "<span>" a line under the body tag (and the corresponding </span>) and the issue doesn't occur.

Comment 4

[Simon Montagu :smontagu]

The patch for bug 424631 fixes this for me.

Comment 5

[Carsten Book [:Tomcat]]

(In reply to comment #4)
> The patch for bug 424631 fixes this for me.
> 

confirmed, the patch also fixes this problem for me on mac with the testcase
and also the real wiki site

Comment 6

[Mike Beltzner [:beltzner, not reading bugmail]]

Do we know how common this pattern (see comment #3) is on the web? I've been browsing some bidi websites that aren't Wikipedia, and things seem to work fine. Some examples:

http://mozilla.org.il/evangel.shtml
http://www.ynet.co.il/home/0,7340,L-8,00.html

We've run across limited examples where it doesn't work:

http://he.wikipedia.org/wiki/%D7%A2%D7%9E%D7%95%D7%93_%D7%A8%D7%90%D7%A9%D7%99

but so far they're all on Wikipedia. Anyone in the bidi community able to comment? I would imagine that Mano would have screamed if this was more common ;)

Comment 7

[Asaf Romano (gone)]

I don't use the Internet as much as you think I do :p

Comment 8

[Daniel Holbert [:dholbert]]

Was this fixed by the checkin for bug 424631 @ noonish today?

Comment 9

[Gary Kwong [:gkw] [:nth10sd] (NOT official MoCo now)]

Consolidating IRC discussion / discoveries for possible related jiggles:

http://www.google.ae/ - near the middle, click and hold on "English".
http://ma7room.com/ - highlight email address near top, webmaster @ ...
http://study4uae.com/vb/index.php - near the bottom, hover.

All of the above are Alexa Top100 sites, some Arabic etc.

Comment 10

[Uri Bernstein]

Attachment: smaller testcase

This has only two levels of nested inlines. Hover to see the effect.

Comment 11

[Uri Bernstein]

(In reply to comment #8)
> Was this fixed by the checkin for bug 424631 @ noonish today?
> 

Yes, this is fixed by that checkin (tested locally. I'll try to also pull an "hourly" build and verify).

Comment 12

[Uri Bernstein]

Verified fixed with
Mozilla/5.0 (Macintosh; U; PPC Mac OS X 10.4; en-US; rv:1.9pre) Gecko/2008032714 Minefield/3.0pre.

I'll leave it for someone else to double-check and mark this VERIFIED.

Not sure whether there is a decision on respinning b5 for this. I think it makes sense to do so.

Comment 13

[Henrik Skupin [:whimboo][⌚️UTC+1]]

(In reply to comment #12)
> I'll leave it for someone else to double-check and mark this VERIFIED.

Will do that when the build is ready.

> Not sure whether there is a decision on respinning b5 for this. I think it
> makes sense to do so.

Otherwise adding a relnote?

Comment 14

[Jesse Ruderman]

Attachment: possible reftest [checked in]

These reftest use height instead of underline, since height can be changed without affecting the rendering when everything is working correctly.

Only 'b' fails in a build with the bug.  'a' is included for sanity.

Both pass in a build with the patch.

Comment 15

[Henrik Skupin [:whimboo][⌚️UTC+1]]

Verified with Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.4; en-US; rv:1.9pre) Gecko Minefield/3.0pre ID:2008032723

Until this isn't definitely fixed for beta5 lets set the TM to mozilla1.9.