989995 - [Mac] Vertical line cuts 'x' close button when hovering tab

Status: RESOLVED DUPLICATE of bug 878023

(Firefox :: Theme, defect)

Description

[Bogdan Maris, Desktop Test Engineering]

Attachment: Screenshot showing the issue

Reproducible on Firefox 29 beta 3 (BuildID: 20140327140727)
Reproducible on the latest Aurora (BuildID: 20140331004001)
Reproducible on the latest Nightly (BuildID: 20140330030202)
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:29.0) Gecko/20100101 Firefox/29.0

Steps to reproduce:
1. Start Firefox.
2. Open two websites in two different tabs.
2. Enter 'Customize' and drag the Search bar to navigation toolbar.
4. Exit Customization.
5. Focus the first tab and hover on the second one.

Expected results: No visual issues when hovering over other tabs.

Actual results: There can be seen a strange vertical bar that cuts the close 'x' button from the hovered tab.

Notes:
1. Not reproducible on Windows nor Ubuntu, reproducible on 10.9.2 and 10.6.8.
2. This issue is a regression. I will provide a regression range ASAP.

Comment 2

[Bogdan Maris, Desktop Test Engineering]

m-c
Last good revision: 84a5a5800bd3 (2013-12-02)
First bad revision: 8648aa476eef (2013-12-03)
Pushlog:
http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=84a5a5800bd3&tochange=8648aa476eef

m-i
Last good revision: 19bfb5a02699
First bad revision: 24161557228b
Pushlog:
http://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=19bfb5a02699&tochange=24161557228b