Changing theme not taking effect

[Heather Ellsworth]

On and up-to-date 22.04 VM (virt-manager 4.0.0-1 on 22.04 hardware host), when I change the theme in gnome-tweaks, it does not immediately take effect. These are the journalctl logs:

Sep 27 22:18:19 jammy snapd-desktop-i[1393]: New theme: gtk=Yaru-dark icon=Yaru cursor=Yaru, sound=Yaru
Sep 27 22:18:19 jammy snapd-desktop-integration.snapd-desktop-integration[1393]: All available theme snaps installed

If I log out and back in, still the theme is not applied. If I reboot the system, the new theme is applied.

On the 22.04 host, I notice that the theme is applied to the chromium snap immediately. It still does not apply to gnome-tweaks itself.

When I tested gnome-tweaks 2 weeks ago for https://bugs.launchpad.net/ubuntu/+source/gnome-tweaks/+bug/1988276, it applied the theme immediately to gnome-tweaks as well as all other apps.

[Heather Ellsworth (hellsworth)]

The issue affects Kinetic too. When you change the theme, it does immediately update the chromium snap but other apps (both snap and non-snap) seem unchanged. I tested a limited number of apps for the immediate theme change:
* chromium snap - theme updated immediately
* gnome calculator (both deb and snap) - theme updated in the snap immediately
* gnome tweaks (deb) - theme not updated

It seems like the theme of the snaps are being updated immediately via snapd-desktop-integration, but the debs are not being updated until a reboot.