1324890 - [RTL] On long tab names, only the page title's last words are shown

Status: VERIFIED FIXED

(Firefox :: Tabbed Browser, defect)

Description

[Itiel]

Environment:
RTL build of Nightly (tested on Hebrew only)
Preferably open many tabs so they will fill the screen width

STR:
1. On one of the previously opened tabs, load a page whose title is in LTR language and is relatively long (for example: http://www.droidforums.net/threads/what-you-need-to-know-about-rooting.70875/ )
2. Observe the page's title in the tab

Expected:
The first words of the page's title should appear

Actual result:
The last words of the page's title appear. So in the mentioned URL, the tab's title is shown as "& News" instead of "What you".

Note that the same issue MAY apply to LTR builds, but with page titles in an RTL language.
An example of such a page, for testing:
https://community.mozilla.org.il/viewtopic.php?f=16&t=12474&start=15

This is a regression as it works just fine in 50.1 or 52.0a2.

Comment 1

[Tomer Cohen :tomer]

Tabs titles inherit browser direction, but should get its direction independently. It can be reproduced on RTL UIs with websites with RTL titles. 

Similar problem can occur when accessing the site "Walla!" [http://www.walla.co.il] using LTR UI.

Comment 2

[Itiel]

Attachment: RTL texted tab in Nightly LTR

Comment 3

[Itiel]

Fixed by bug 1357656.