GTK dark theme/style not applying?

[peterrus]

Edit: Solved in https://github.com/orgs/regolith-linux/discussions/1044#discussioncomment-10691886

Hi! I am running Ubuntu 24.04 with Regolith 3.2 and I having trouble getting the dark theme to apply to Nautilus, gnome-settings and all other GTK applications. Even though the dark theme/style is applied all GTK windows keep using the light/default theme (On i3 and sway sessions) as seen in screenshot below. When starting a Gnome (Wayland or X11) session everything works as expected.

Am I doing something wrong or should I open an issue for this?

This happens on a clean fully updated install of both Ubuntu+Regolith.

Edit: I think GTK2/3 windows are styled properly and it's just GTK4 stuff that doesn't respect the setting under Regolith sessions.

Edit2: Third party (non-gtk)-applications that use the 'system style' to determine if they should show a dark/light theme also default to the light style even thought I set the system style to dark in gnome-settings.

[peterrus]

@kgilmer Is this something that you have seen on your dev environments? Should I open an issue for this?

[kgilmer]

Hi @peterrus , yes this is a known issue. Gtk4 apps in general do not theme well in regolith. "Dark mode" is a gnome feature that is unimplemented in regolith as of version 3.2.

[peterrus]

Ah! That's not the news I was hoping for but good to know this is at least to be expected ;)

Is this documented somewhere (which I missed)? If not: At least we now have this thread.

[made4this]

@peterrus, @kgilmer: James Thistlewood solved it for us!

[peterrus]

That's great! Works for me! Thanks 👍

[fjellvannet]

Upvote for this issue :)

Or for creating an issue of this if it has not been created yet.

[peterrus]

See https://github.com/orgs/regolith-linux/discussions/1044#discussioncomment-10691886