1714930 - Tab bar is enlarged after entering and leaving DOM fullscreen mode on KDE

Status: RESOLVED INCOMPLETE

(Core :: Widget: Gtk, defect, P3)

Description

[fabian.ruttmann]

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:89.0) Gecko/20100101 Firefox/89.0

Steps to reproduce:

1. Start up Firefox on a Linux machine with the KDE desktop environment.
2. Open a page with any DOM element that can be put into fullscreen mode, for example a video on YouTube (the issue also occured on Netflix, Vimeo, edition.cnn.com and BigBlueButton, so probably on any site).
3. Leave fullscreen mode

The issue only occurs on the first opened window of the browsing session. Opening another window and performing steps 2 and 3 has no visible impact on the tab bar.

Linux distro: Arch Linux
KDE Plasma Version: 5.21.5
KDE Frameworks Version: 5.82.0

Actual results:

The height of the tab bar at the top of the browser's UI is much bigger than it was initially, being a little more than twice as large as it was before entering fullscreen mode.

Expected results:

The tab bar height should stay the same, as the big tab bar impairs browsing experience, making the viewport of the website smaller and the tab bar less easy to use.

Comment 1

[fabian.ruttmann]

Attachment: Example of big tabs

Comment 2

[BugBot [:suhaib / :marco]]

The Bugbug bot thinks this bug should belong to the 'Core::Widget: Gtk' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.

Comment 3

[Martin Stránský [:stransky] (ni? me)]

Do you still see it?
Thanks.

Comment 4

[BugBot [:suhaib / :marco]]

Redirect a needinfo that is pending on an inactive user to the triage owner.
:stransky, since the bug has recent activity, could you please find another way to get the information or close the bug as INCOMPLETE if it is not actionable?

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