2000732 - [i3] Firefox window shrinks size when losing focus

Status: UNCONFIRMED

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

Description

[hexapode.arthropode]

Attachment: Firefox border shrink.png

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:145.0) Gecko/20100101 Firefox/145.0

Steps to reproduce:

When using i3 windows manager, the Firefox windows shrinks size when losing focus and recover its full size again with the focus. It leaves a small border between the firefox window and the i3 WM window (see attached screenshot)

Using mozregression, it is actually a regression happening in 2022 somewhere between b8732a1c1fa931fc3cc5369e31a64db459f60c83 and 0671f5ff7249d3d7c458a29a4099a093c01f0ac1

Comment 1

[Thinker Li [:sinker]]

Could you run firefox with env variable MOZ_LOG="Widget:5"?
It will generate some log about window size.

Comment 2

[hexapode.arthropode]

Attachment: Widget log after acquiring and losing focus

Comment 3

[hexapode.arthropode]

I tried to compile old versions of Firefox to find the specific regression commit between the nightly builds of 2022-04-07 and of 2022-04-08, but it seems the compile chain is too old.
I can compile the current version, but the old version fail because of missing artifacts, even if I used the configure option without artifacts. It seems there is no simple way to reproduce the compile chains of these old version, is it ?

Comment 4

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

You can use mozergression tool directly:
https://fedoraproject.org/wiki/How_to_debug_Firefox_problems#Use_Mozregression_tool