Bug 437082

Summary:	gtk3 csd apps do not respect third-party window decoration theme on Wayland
Product:	[Applications] systemsettings	Reporter:	Patrick Silva <bugseforuns>
Component:	kcm_style	Assignee:	Plasma Bugs List <plasma-bugs>
Status:	RESOLVED UPSTREAM
Severity:	normal	CC:	alois1, aoeui, mail, nate, openmindead, plasma-bugs, trmdi
Priority:	NOR	Keywords:	wayland-only
Version:	unspecified
Target Milestone:	---
Platform:	Neon
OS:	Linux
URL:	https://gitlab.gnome.org/GNOME/gtk/-/issues/3409
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Patrick Silva 2021-05-14 12:07:27 UTC

STEPS TO REPRODUCE
1. start Wayland session
2. apply a third-party window decoration theme in Window Decorations KCM (I applied
Breezemite installed from KDE Store)
3. open a gtk3 csd app (Gnome Disks, for example)

OBSERVED RESULT
gtk3 csd app used in the step 3 does not respect the window decoration theme
applied in the step 2.

EXPECTED RESULT
gtk3 csd apps should respect third-party window decoration theme on Wayland,
like on X11.

SOFTWARE/OS VERSIONS
Operating System: KDE neon Unstable Edition
KDE Plasma Version: 5.22.80
KDE Frameworks Version: 5.83.0
Qt Version: 5.15.2
Graphics Platform: Wayland

Comment 1 Alois Wohlschlager 2021-05-15 09:02:19 UTC

This issue is due to GTK ignoring the gtk-modules directive in settings.ini when running on Wayland. Unfortunately, bugs like [1] need to be sorted out before.

[1] https://bugs.kde.org/show_bug.cgi?id=428322

Comment 2 Mikhail Zolotukhin 2021-05-19 05:21:36 UTC

If GTK ignores modules string there is nothing we can do about it. GTK devs do not want us to modify the css theme on the go, so I am pessimistic about our support of theme consistency on wayland and flatpak.

See also: https://gitlab.gnome.org/GNOME/gtk/-/issues/3409

Comment 3 Nate Graham 2021-05-19 15:41:02 UTC

:(

Comment 4 trmdi 2021-06-20 13:23:49 UTC

> If GTK ignores modules string there is nothing we can do about it.

It only ignores setting.ini.
We can still set it in other places e.g using systemd environment.d generator to set GTK3_MODULES...

Comment 5 Nate Graham 2021-07-28 20:19:52 UTC

*** Bug 438898 has been marked as a duplicate of this bug. ***