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Flatpak GTK apps not follwing the chosen GTK theme.

Hello. I’m using Debian testing with KDE Plasma 5.27. I’m experiencing a problem where GTK Flatpaks are not following the chosen GTK theme despite giving them permissions to access .themes and .icons folders found in the home directory. I tried the running the following commands in the terminal:

flatpak override --filesystem=xdg-config/gtk-4.0:ro flatpak override --filesystem=xdg-config/gtk-3.0:ro

I even tried to specify a certain GTK theme to be chosen, that resulted in the flatpak changing to an ugly white-adwaita theme. I should note that this is happening exclusively with GTK Flatpaks, QT Flatpaks and GTK deb packages don’t seem to have this problem. What am I missing here? Any help would be appreciated.

pH3ra ,
@pH3ra@lemmy.ml avatar

In this video explains everything you should know about flatpak theming.
As others said, you probably haven’t installed the chosen theme yet.

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Here is an alternative Piped link(s): piped.video/watch?v=IYXlgzrZRIE

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mitram2 ,

Have you installed xdg-desktop-portal-gtk?

josephsh5 OP ,

xdg-desktop-portal-gtk?

Yes, it’s already installed.

hellvolution ,
@hellvolution@lemmygrad.ml avatar

Old ass adwaita/libadwaita bug; happens on every distro… I’m really starting to think it is more related to libadwaita itself than to flatpak 😭

furzegulo ,

try this bugsfiles.kde.org/attachment.cgi?id=135846

furzegulo ,

here’s the same as text

sudo apt install xdg-desktop-portal-gtk

systemctl --user edit xdg-desktop-portal.service

  1. paste these two lines

<span style="color:#323232;">[Service]
</span><span style="color:#323232;">
</span><span style="color:#323232;">Environment="XDG_CURRENT_DESKTOP=sway"
</span>

systemctl --user restart xdg-desktop-portal.service

josephsh5 OP ,

This also refused to work unfortunately.

med ,

Is it being forced to look for a theme installed via flatpak maybe?

josephsh5 OP ,

How do I know that exactly?

med ,

Apparently there has been a problem with gtk4 apps and theming in flatpak, only supporting adwaita light and dark - only found vague reference to it though, nothing concrete.

Try


<span style="color:#323232;">flatpak-metadata sockets
</span>

To see if you can find the GTK_THEME environment variable.

You’ve given it permission to access the themes folder, now you need go point it at the themes


<span style="color:#323232;">sudo flatpak override --env=GTK_THEME=my-theme 
</span><span style="color:#323232;">sudo flatpak override --env=ICON_THEME=my-icon-theme
</span>

Where my-theme is the theme name, e.g. Adwaita-dark

Apparently the flatseal gui has some functionality to set the theme too! Will check it out tomorrow to see what’s up.

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