1950324 - Tab switcher dialog does not scale properly

Status: UNCONFIRMED

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

Description

[Aditya]

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:135.0) Gecko/20100101 Firefox/135.0

Steps to reproduce:

I pressed Ctrl + Tab to open up the tab switcher.
I am using Firefox 135 on Fedora 41 with GNOME 47 with a 1440p external monitor and 1080p external monitor (native display of my laptop is turned off).

Actual results:

• The parent window for the tab previews was not centered and the tab previews overlapped each other instead of being separate.
• I scaled down the resolution on my monitor to 1080p and the issue was fixed (as well as on the 2nd monitor).
• I also checked and found out that this issue starts happening when number of tabs is more than 5.
• This issue also happened on the native display of my laptop (2160x1350). However the amount of overlap was reduced.

Expected results:

The tab previews should not overlap and the parent window of the previews should be centered

Comment 1

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

Please attach content of about:support page and screen shot how it looks like.
Thanks.

Comment 2

[Aditya]

Attachment: Screenshot From 2025-02-25 11-36-44.png

Screenshot of the bug

Comment 3

[Aditya]

Attachment: about:support

Comment 4

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

Looks like you're using two displays:

Display0: 2560x1440@60Hz scales:1.000000|1.000000
Display1: 1920x1080@60Hz scales:1.000000|1.000000

Can you try to turn one off and check again?
Thanks.

Comment 5

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

Is that a recent regression? Did it worked before?

Comment 6

[Aditya]

1. After I turned off the 1080p display, the issue was fixed. However now that I have turned it on again, it has gone back to the original buggy condition. I also noticed this only happens when I "place" the 2nd (1080p) monitor on the left of the main (1440p) monitor in GNOME display settings. If I place it on the right, this does not happen.
2. It definitely happened before this version update (on version 134). I don't know which all versions are affected though.

Comment 7

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

I see, so looks like we don't detect correctly the display size for particular window. Does it happens if you run Firefox with MOZ_ENABLE_WAYLAND=0 env variable? i.e. run firefox on terminal as:

MOZ_ENABLE_WAYLAND=0 firefox

Thanks.

Comment 8

[Aditya]

No change