1206508 - [e10s] Tab thumbnail(tab drag image) is broken while tab move animation on Windows7 Classic

Status: RESOLVED FIXED

(Firefox :: Tabbed Browser, defect)

Description

[Alice0775 White]

[Tracking Requested - why for this release]:

This problem only happen on Windows7 Classic with e10s.


Steps To Reproduce:
1. Open about:home in 2 tabs
2. Drag a tab and move it 

Actual Results:
 The tab thumbnail becomes wrong.
 The tab thumbnail seems to re-capture the image below of the thumbnail rectangle during tab animation.

Expected Results:
 The tab thumbnail should capture contents, not chrome etc



Regression window:
https://hg.mozilla.org/integration/fx-team/pushloghtml?fromchange=fb266acf3160a8786db737048285c6b38d9e51c3&tochange=005290f8c1d5

Regressed by:
005290f8c1d5	Felipe Gomes — Bug 1205398 - e10s drag-n-drop panel should be mousethrough=always. r=jimm

Comment 1

[Alice0775 White]

Attachment: screen capture

Comment 2

[:Felipe Gomes (needinfo for replies!)]

From the video, this looks like more a gfx problem that was being masquerading by drag-n-drop not working properly with it. Alice, can you record a screen capture with the build immediately before that doesn't include bug 1205398 so that we can see how it behaves?

Comment 3

[Alice0775 White]

Attachment: screen capture(build immediately before that doesn't include bug 1205398)

build immediately before that doesn't include bug 1205398
https://hg.mozilla.org/integration/fx-team/rev/fb266acf3160a8786db737048285c6b38d9e51c3
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:43.0) Gecko/20100101 Firefox/43.0 ID:20150916161622

Comment 4

[:Felipe Gomes (needinfo for replies!)]

Thanks Alice for confirmation. This problem is very strange. I think it's unrelated to bug 1205398, but in any case I will back it out while investigating the problem. The problem that made me file bug 1205398 only affects Mac (where the drag-n-drop thumbnail sits underneath the mouse pointer), so maybe we can fix it differently on Mac by making the thumbnail positioning similar to the other platforms.

Comment 5

[:Felipe Gomes (needinfo for replies!)]

Fixed by backout of bug 1205398