501028 - text layout shifts around in a stationary element with -moz-transform: rotate

Status: NEW

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

Description

[(not currently active) Ted Mielczarek]

See the provided URL. The first example is a <div> with -moz-transform: rotate style applied. For some reason, the text moves around even though the element is stationary. I couldn't reproduce on an OS X Shiretoko nightly, so this is either trunk-only or Windows-only.

Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2a1pre) Gecko/20090625 Minefield/3.6a1pre

Comment 1

[Robert O'Callahan (:roc) (email my personal email if necessary)]

On OS X I can see all kinds of invalidations coming from somewhere even though nothing seems to be changing. That's one problem. The fact that this causes text to visibly jiggle is another problem, perhaps Windows-only.

Comment 2

[Victor Gigante-Hueber]

Reproduced in Seamonkey:

Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.9pre) Gecko/20100226 SeaMonkey/2.0.4pre

Curiously enough, it seems to happen only on the linked page.  I tried writing up a testcase using the sample CSS code on the page, and it does not reproduce in the testcase.  Perhaps there is something else happening here?

Comment 3

[Victor Gigante-Hueber]

Attachment: CSS testcase

This seems to work in:

Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.9pre) Gecko/20100226 SeaMonkey/2.0.4pre

Comment 4

[Daniel Kirsch]

I see a similar effect in that testcase: attachment 440798 [details]

Comment 5

[Daniel Kirsch]

Attachment: Screenshot from attachment 440798

Screenshot created with Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.3a5pre) Gecko/20100421 Minefield/3.7a5pre

As soon as I select the text it will be shown rotated too. 
Interesting: The text in the <code> element seems to be always correct.

Comment 6

[Jason Woofenden]

Attachment: jason testcase

here's my test case. Firefox 6.0.2 on debian unstable renders broken by default. some fondling with the mouse can get it right for a bit sometimes.

Comment 7

[Jason Woofenden]

Attachment: jason testcase render

If you select some of the (broken rendered) vertical text, sometimes it'll render correctly.

Comment 8

[Jason Woofenden]

I've just attached the testcase I used to find this bug. and a screenshot of my firefox rendering it. Earlier today I posted my testcase to irc, and got someone else to test it. He got the same results on Gentoo with Firefox 6.0.

Please look below my signature for output of "reportbug iceweasel" so my package manager can supply you all sorts of info about my extensions and exact versions of everything relevant.

Oh, I also want to mention this bug:

https://bugzilla.mozilla.org/show_bug.cgi?id=518172

It seems to be the same rendering bug, but was closed about a year ago.


Thanks,   - Jason


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