1411964 - [Older gtk only] Overflow panel looks "duplicated" after unpinning an item from the panel

Status: NEW

(Core :: Graphics, defect, P3)

Description

[Emil Ghitta, QA [:emilghitta]]

[Affected versions]:
Firefox 57.0b11 (BuildId:20171023180840)
Firefox 58.0a1  (BuildId:20171025230440)

[Affected platforms]:
- Ubuntu 14.04 64bit
- Ubuntu 12.04 32bit

[Unaffected platforms]:
- Ubuntu 16.04  64bit
- macOS 10.12
- Windows 10 64bit

[Steps to reproduce]:
1. Launch Firefox.
2. Access the Customize panel.
3. Drag two items in the overflow panel.
4. Exit the Customize mode.
5. Open the Overflow menu.
6. Unpin 1 of the item.

[Expected result]:
The item is successfully unpinned and no issues are encountered.

[Actual result]:
The item is unpinned but graphical issues can be seen.

[Regression range]:
This seems like a regression.

I will get back with this as soon as time permits.

[Additional notes]:
Form more information regarding this issue please observe the following screencast:https://drive.google.com/open?id=0B94iuIVMr-TEbDlwLUg3VEwyTVE

Comment 1

[:Gijs (he/him)]

Milan, how extensive is our graphics support for older versions of Linux/GTK ? Given that this is Linux-only and only reproduces on old OSes, not sure how important this is (and maybe this needs to move to Widget/GTK, but I don't know enough to make that call).

Emil, how sure are you about this being a regression (other than, perhaps, the functionality not working the same way previously)? This feels like a platform bug to me. Perhaps one that we only exposed recently, but it seems unlikely that the bug itself is recent...

Comment 2

[:Gijs (he/him)]

We've also already wontfixed bug 1411978, I wouldn't be opposed to doing the same here.

Comment 3

[Emil Ghitta, QA [:emilghitta]]

The following pushlog was generated using mozregression:

https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=5a63d8457a2a69a2ad54a50765bff412580df2a4&tochange=14db7c0bcf9ae86c9ec2cc9d3c249a42e459a2a9

Please let me know if this helps.

Comment 4

[:Gijs (he/him)]

Not tracking this for photon cleanup.