1964245 - Blue Line appears when fullscreening media using Right Vertical Tabs

Status: VERIFIED FIXED

(Firefox :: Sidebar, defect, P3)

Description

[jacob]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:137.0) Gecko/20100101 Firefox/137.0

Steps to reproduce:

Right Vertical Tabs on, fullscreen on youtube, twitch, etc., hide mouse by moving the mouse all the way to the right of the screen

Actual results:

The blue line that appears when adjusting tab width when using vertical tabs shows up when viewing fullscreen content (video, picture)

Expected results:

Detect when media is fullscreen and not have a blue line appear when moving the mouse to the right of the screen

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Firefox::Sidebar' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 2

[Alice0775 White]

I can reproduce the light-blue on Nightly140.0a1 Windows11, and orange line on Ubuntu24.04.

Comment 3

[Alice0775 White]

Regression window:
https://hg-edge.mozilla.org/integration/autoland/pushloghtml?fromchange=2a8c811ce3730a7b267debd4cc5a1ba843101515&tochange=403b8d578bda74a72c2fb3b33a3b9063c37efc52

Comment 4

[BugBot [:suhaib / :marco/ :calixte]]

Set release status flags based on info from the regressing bug 1954956

:emilio, since you are the author of the regressor, bug 1954956, could you take a look? Also, could you set the severity field?

For more information, please visit BugBot documentation.

Comment 5

[Emilio Cobos Álvarez (:emilio)]

Attachment: Bug 1964245 - Sidebar launcher splitter should be collapsed in fullscreen. r=#sidebar-reviewers

Comment 6

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/aeea339cfcfd
Sidebar launcher splitter should be collapsed in fullscreen. r=desktop-theme-reviewers,tabbrowser-reviewers,dao

Comment 9

[Narcis Beleuzu [:NarcisB]]

https://hg.mozilla.org/mozilla-central/rev/aeea339cfcfd

Comment 10

[BugBot [:suhaib / :marco/ :calixte]]

The patch landed in nightly and beta is affected.
:emilio, is this bug important enough to require an uplift?

• If yes, please nominate the patch for beta approval.
  • See https://wiki.mozilla.org/Release_Management/Requesting_an_Uplift for documentation on how to request an uplift.
• If no, please set status-firefox139 to wontfix.

For more information, please visit BugBot documentation.

Comment 11

[Emilio Cobos Álvarez (:emilio)]

Attachment: Bug 1964245 - Sidebar launcher splitter should be collapsed in fullscreen. r=#sidebar-reviewers

Original Revision: https://phabricator.services.mozilla.com/D247702

Comment 12

[Phabricator Automation]

firefox-beta Uplift Approval Request

• User impact if declined: comment 0
• Code covered by automated testing: no
• Fix verified in Nightly: yes
• Needs manual QE test: yes
• Steps to reproduce for manual QE testing: comment 0
• Risk associated with taking this patch: low
• Explanation of risk level: trivial css patch
• String changes made/needed: none
• Is Android affected?: no

Comment 13

[Pulsebot]

https://hg.mozilla.org/releases/mozilla-beta/rev/34fb98c79bd4

Comment 14

[Daniel Bodea [:danibodea]]

I can reproduce this issue in Nightly v140.0a1 from 2025-05-05 and Beta v139.0b5 and I can confirm the fix in Nightly v140.0a1 from 2025-05-07 and 2025-05-08. Testing was performed in Windows 10, Ubuntu 22, MacOS 11 Intel and MacOS 14 ARM. This issue might be specific to Windows and Linux since it could not be reproduced on either MacOS.

The fix will be verified in Beta v139.0b6 when available.

Comment 15

[Daniel Bodea [:danibodea]]

This fix is also confirmed in Beta v139.0b7 in Windows 10 and Ubuntu 22. Thank you.