1207520 - CSS transform flicker on fixed position panel (/firefox/tour/ page)

Status: RESOLVED DUPLICATE of bug 1206418

(Core :: Graphics: Layers, defect)

Description

[Alex Gibson [:agibson]]

44.0a1 (2015-09-22)

User agent: "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:44.0) Gecko/20100101 Firefox/44.0"

STR:

1.) Start Firefox Nightly with a fresh profile
2.) Click Help -> Firefox Tour
3.) When the page loads, click the green "Let's go" button in the door hanger to start the tour.
4.) When the bottom panel opens and shows the first step of the tour, click the 'x' button to minimize the tour.

Expected results:

The tour panel should transition smoothly to the minimized state.

Actual results:

The CSS transform flickers badly, and the panel jumps around the screen while animating.

Comment 1

[Alex Gibson [:agibson]]

Attachment: transform-flicker-bug.mov

Attached a video of the bug for reference

Comment 2

[Alex Gibson [:agibson]]

I see the same flicker in Nightly on Windows 10, so it does not seem to be limited to just OSX

Comment 3

[Alex Gibson [:agibson]]

I ran this bug through mozregression and came up with this pushlog:

https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=2074a0012421534e32c094dc36edff8c720d31b6&tochange=fbf63ce1ba882223a2eda0644bbecc23e8670d6b

Comment 4

[Alex Gibson [:agibson]]

Last good revision: 2074a0012421534e32c094dc36edff8c720d31b6
First bad revision: fbf63ce1ba882223a2eda0644bbecc23e8670d6b

Comment 5

[u279076]

Alex, thanks for reporting this bug and finding the regression window. Bug 1097464 landed in Firefox 43 so I would expect this to affect our latest Aurora builds as well at this point. Could you please check one of the 43.0a2 builds from http://archive.mozilla.org/pub/firefox/nightly/latest-mozilla-aurora/ ?

Thinker, can you please look in to this since it was your change which introduced the regression?

Comment 6

[Alex Gibson [:agibson]]

(In reply to Anthony Hughes, QA Mentor (:ashughes) from comment #5)
> Alex, thanks for reporting this bug and finding the regression window. Bug
> 1097464 landed in Firefox 43 so I would expect this to affect our latest
> Aurora builds as well at this point. Could you please check one of the
> 43.0a2 builds from
> http://archive.mozilla.org/pub/firefox/nightly/latest-mozilla-aurora/ ?

Yes, I can confirm that the regression is also present in the Firefox 43 builds linked in Comment 5.

Comment 7

[Thinker Li [:sinker]]

I believe this is a duplication of Bug 1206418.  There is already a patch to fix that.

Comment 8

[u279076]

(In reply to Thinker Li [:sinker] from comment #7)
> I believe this is a duplication of Bug 1206418. There is already a patch to fix that.

Thanks, I'll add that as a dependency.

Alex, please watch that bug and check to see if this is fixed when that patch lands.

Comment 9

[Bas Schouten (:bas.schouten)]

Has this been fixed for you with the landing of bug 1206418?

Comment 10

[Alex Gibson [:agibson]]

(In reply to Bas Schouten (:bas.schouten) from comment #9)
> Has this been fixed for you with the landing of bug 1206418?

Yes, the issue seems to have done - thanks!