GTK Flatpak Apps no longer apply themes after update ?

[SpidFightFR]

Is this a new report?

Yes

System Info

Void 6.5.5_1 x86_64 AuthenticAMD uptodate rrmFFFFFFFF

Package(s) Affected

flatpak-1.15.4_2 flatpak-kcm-5.27.8_1 xdg-desktop-portal-gtk-1.14.1_2

Does a report exist for this bug with the project's home (upstream) and/or another distro?

No response

Expected behaviour

Given we grand read access to ~/.themes and ~/.icons, and that we enable a specific env var, the selected theme in the env var should be applied (it was up until recently).

Actual behaviour

Recently, it stopped working, out of the blue, without any reasons.

I believe it started happening since flatpak-kcm update, but i might be wrong.
QT apps do work as intended tho, so perhaps it is linked to the xdg gtk portal too?

Steps to reproduce

1. sudo xbps-install -Su
2. Update flatpak-kcm
3. Theme no longer works on gtk apps :(

[mayhair]

See #46317 (comment) for a workaround.

[SpidFightFR]

Thank you, @mayhair ! 🙏

Indeed this solved the issue for me.
If that can help someone, here is my config for Plasma: (this should be located in ~/.config/xdg-desktop-portal/ - for newcomers, to avoid more searching)

kde-portals.conf

[preferred]
# use xdg-desktop-portal-gtk for every portal interface
default=gtk
# except for the xdg-desktop-portal-wlr supplied interfaces
org.freedesktop.impl.portal.Screencast=kde
org.freedesktop.impl.portal.Screenshot=kde
#uses KDE file dialog instead of the gtk file dialog
org.freedesktop.impl.portal.FileChooser=kde

On a sidenote, this would be much appreciated from the xdg desktop portals team to let us truly know when such a major change comes up instead of doing it the shady way. 😜