1716508 - Titles that start with RTL characters are not rendered correctly in tabs

Status: RESOLVED DUPLICATE of bug 1701394

(Firefox :: Tabbed Browser, defect)

Description

[Noam Tamim]

Attachment: firefox-proton-tabs-bidi-bug.mov

Open a tab with a page whose title starts with an RTL character. Example:

data:text/html,<meta charset="utf-8"/><title>%E2%80%8Fstring</title>

1. Observe that in the tab bar, the title text is aligned to the right instead of the left
2. Move the mouse cursor around and observe that the title text jumps on hover

The attached clip shows the behavior.

The text should be aligned to the left, like text that doesn't start with an RTL character.
Compare to:

data:text/html,<meta charset="utf-8"/><title>string</title>

Note that when the title is long, this behavior also affects cropping.

This issue is new in Proton.

Comment 1

[Noam Tamim]

A better testcase:

data:text/html,<meta charset="utf-8"/><title>%D7%90%D7%90%D7%90</title>

The original testcase used the invisible RTL marker.

Comment 2

[Noam Tamim]

Attachment: firefox-proton-tabs-bidi-bug-2.mov

Comment 3

[Noam Tamim]

Attachment: firefox-proton-tabs-bidi-bug-2.mov