1264140 - Facebook video in fullscreen has incorrect rendering

Status: RESOLVED DUPLICATE of bug 1264142

(Core :: Layout, defect)

Description

[Jet Villegas (inactive)]

Watching Facebook videos (4:3 aspect ratio) in fullscreen displays the old page background where black bars should be. This is on a Retina Macbook. Doesn't affect YouTube videos in fullscreen.

Comment 1

[Jet Villegas (inactive)]

Seems intermittent and I was able to repro without fullscreen on Facebook videos in the main timeline UI. The symptoms appear to be Gecko painting from a stale buffer for the background.

Comment 2

[Daniel Holbert [:dholbert]]

I can reproduce in Linux Nightly as well, using this video in fullscreen, in a fresh profile:
 https://www.facebook.com/mozilla/videos/10154006157677381/

In my normal browsing profile, I didn't hit this until the second time I entered fullscreen. So, this does seem to be a bit intermittent, but still not hard to trigger.

Comment 3

[Daniel Holbert [:dholbert]]

Attachment: testcase 1 (view in fullscreen)

I can reproduce with any fullscreen HTML5 video that doesn't fit my screen's aspect ratio.

For example, this screencast of a text editor.  Just load this video, and then click the fullscreen button on the video.

EXPECTED RESULTS: you should just see a text editor with black bars on the sides.
ACTUAL RESULTS: I see remnants of my Firefox window on the sides, instead of a black background.

Comment 4

[Daniel Holbert [:dholbert]]

Dupe of bug 1264142 I think.