1227129 - 'Exit Full Screen (Esc)' text bounce to the right and returns to its initial position

Status: VERIFIED FIXED

Description

[Ada [:adalucinet]]

Reproducible with Firefox 43 beta 5, latest Developer Edition 44.0a2 and latest Nightly 45.0a1
Affected platforms: Windows 7 64-bit (2 different machines) and Mac OS X 10.11.1

Steps to reproduce:
1. Launch Firefox and go to Add-ons Manager (Ctrl/Cmd + Shift + A).
2. Click on 'Watch the Video' button via Get Add-ons tab
3. Enter fullscreen.
4. Mouse over the Fullscreen notification. 

Expected results: Fullscreen notification is displayed correctly.

Actual results: 'Exit Full Screen (Esc)' text moves to the right and returns to its initial position (please see the attached gif).

Additional notes:
1. Unable to reproduce under Ubuntu 14.04 32-bit.
2. Not reproducible with Nightly from 2015-08-15 - will investigate further.

Comment 1

[Ada [:adalucinet]]

Here is the gif - https://goo.gl/wqcRfR (couldn't manage to attach it)

Comment 2

[Xidorn Quan [:xidorn] UTC+10]

I actually have been seeing this issue since the very beginning.

I guess this is because of minor rendering difference when it is moved across layers.

Comment 3

[Xidorn Quan [:xidorn] UTC+10]

Attachment: MozReview Request: Bug 1227129 - Apply 'will-change: transform' to fullscreen-warning when it is shown.

Bug 1227129 - Apply 'will-change: transform' to fullscreen-warning when it is shown.

Since there is a 3s timeout to hide the fullscreen warning, it makes
sense to always apply will-change transform when it is not hidden. This
could also avoid slight rendering difference when it stops moving.

Comment 4

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

Comment on attachment 8691164 [details]
MozReview Request: Bug 1227129 - Apply 'will-change: transform' to fullscreen-warning when it is shown.

https://reviewboard.mozilla.org/r/26085/#review23455

Comment 5

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

Comment on attachment 8691164 [details]
MozReview Request: Bug 1227129 - Apply 'will-change: transform' to fullscreen-warning when it is shown.

https://reviewboard.mozilla.org/r/26085/#review23457

Comment 6

[Xidorn Quan [:xidorn] UTC+10]

https://hg.mozilla.org/integration/fx-team/rev/befb8e2645ef77775bbd5ef7eb866fd51b376458
Bug 1227129 - Apply 'will-change: transform' to fullscreen-warning when it is shown. r=roc

Comment 7

[Xidorn Quan [:xidorn] UTC+10]

Comment on attachment 8691164 [details]
MozReview Request: Bug 1227129 - Apply 'will-change: transform' to fullscreen-warning when it is shown.

Approval Request Comment
[Feature/regressing bug #]: bug 1160023
[User impact if declined]: as described in comment 0 and shown in comment 1
[Describe test coverage new/current, TreeHerder]: n/a
[Risks and why]: very low risk because it is a simple change in style, and the 'will-change' property (the only change here) is generally only a hint for the engine, and isn't meant to cause any major behavior change
[String/UUID change made/needed]: n/a

Comment 8

[Carsten Book [:Tomcat]]

https://hg.mozilla.org/mozilla-central/rev/befb8e2645ef

Comment 9

[Liz Henry (:lizzard)]

Regression from 43, marking affected and tracking for 43+.

Comment 10

[Liz Henry (:lizzard)]

Comment on attachment 8691164 [details]
MozReview Request: Bug 1227129 - Apply 'will-change: transform' to fullscreen-warning when it is shown.

Fix for recent regression in fullscreen style. Please uplift to aurora and beta.

Comment 11

[Carsten Book [:Tomcat]]

https://hg.mozilla.org/releases/mozilla-aurora/rev/7d2a8e1c3339

Comment 12

[Carsten Book [:Tomcat]]

https://hg.mozilla.org/releases/mozilla-beta/rev/31412cdfdf88

Comment 13

[Ada [:adalucinet]]

Verified fixed with latest Nightly 45.0a1, across platforms [1].

[1] Mac OS X 10.11.1, Windows 7 64-bit and Ubuntu 14.04 32-bit

Comment 14

[Ada [:adalucinet]]

Also confirming this fix with Firefox 43 beta 7 (Build ID: 20151126120800) and latest Developer Edition 44.0a2 (from 2015-11-26), under Windows 7 64-bit and Mac OS X 10.11.1