1295257 - Switching tabs to planet mozilla paints garbage background for one frame

Status: RESOLVED DUPLICATE of bug 1225750

(Core :: Layout: Images, Video, and HTML Frames, defect)

Description

[Markus Stange [:mstange]]

Attachment: screenshot

Steps to reproduce:
 1. Cmd+Click this link to open planet mozilla in a background tab: http://planet.mozilla.org/
 2. Wait until the page has finished loading (i.e. until the spinner is gone)
 3. Click on the planet mozilla tab in order to switch to it.

At this point I sometimes see a brief flickering of black or even garbage before the real background image is drawn. It doesn't always happen, and sometimes it happens so quickly that it's hard to miss, but I was able to capture it with a screen recorder.

I can't get a regression window on this system because I'm using the macOS 10.12 beta, and nightlies before 2016-07-13 don't start on this system (due to bug 1284677). The 2016-07-13 nightly already has the bug, so this affects at least 50.

Comment 1

[Markus Stange [:mstange]]

The expected result is that the background should be white, until the background image at http://planet.mozilla.org/img/background.jpg has been decoded.

Resizing the window to be smaller than that image may make this bug easier to reproduce.

Comment 2

[Timothy Nikkel (:tnikkel)]

Pretty sure this is a dupe of bug 1225750.

Comment 3

[Andrew Overholt [:overholt]]

Bug 1225750 is tracked for 50 so let's remove the 'affected' here.