693570 - Content moves down one pixel line when attaching/detaching a tab if Panorama button available

Status: RESOLVED INVALID

(Firefox :: Tabbed Browser, defect)

Description

[AndreiD[QA]]

Attachment: content moving one pixel line

Build IDs (Win7):
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:10.0a1) Gecko/20111010 Firefox/10.0a1
Mozilla/5.0 (Windows NT 6.1; rv:10.0a1) Gecko/20111010 Firefox/10.0a1

STR:
1. Launch Firefox on a clean profile
2. Create 2 groups with at least one tab in each one
3. In one of the groups detach/attach a tab to the tab strip

Expected result:
In step 3, the content of the tab should not move

Actual result:
In step 3, the content of the tab moves one pixel line (up when detaching, and down when attaching)

*Notes:
-> This bug is a regression from the behavior before the landing of the bug 455694 (implementation of the feature Tab Animation)
-> The issue is visible on Windows only. The content doesn't move when detaching/attaching tabs on Linux or Mac
-> Here you can see a screen video of the issue

Comment 1

[AndreiD[QA]]

In addition to what's been said above, the issue is visible with one tab only in the tab strip.

Comment 2

[Emil Pasca [:emilpasca]]

User Agent: Mozilla/5.0 (Windows NT 6.1; rv:49.0) Gecko/20100101 Firefox/49.0
User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:49.0) Gecko/20100101 Firefox/49.0

I have tested this issue on Windows 7 x32/x64 with the latest Firefox release (46.0.1, Build ID: 20160502172042) and the latest Nightly (49.0a1, Build ID: 20160525030215) and could not reproduce it. I've followed the STR from comment 0 and when I've detach/attach a tab from the tab strip, the content of the tab didn't move.
I have tested this also on Windows 10 with different customization options (Menu Bar, Bookmark bar on/off) and still could not reproduce it.

Is this still reproducible on your end? Can you please retest this using the latest Firefox release and the latest Nightly build and report back the results?

Comment 3

[(mostly gone) XtC4UaLL [:xtc4uall]]

This is INVALID due to the bug triggering features been removed long time ago.