On Arch Wayland, to force running GTK+ apps to change theme on the fly seems to need manually restarting “GNOME/GTK Settings Synchronization” service.
According to Arch, it seems installing gnome-settings-daemon, gsettings-desktop-schemas and gsettings-qt can help broadcasting Plasma theme settings to running GTK+ apps, but from what I read kde-gtk-config only uses something called GSettings and doesn’t need those packages. So is it safe/required to install them ?
KDE Plasma Version: 5.27.6
KDE Frameworks Version: 5.107.0
Qt Version: 5.15.10
Kernel Version: 6.3.9-3
Graphics Platform: Wayland