gtk3+: Theming for all dialogs
gtk-clients currently apply themes for the main window only. It should be applied to all freeciv dialogs (and widgets)
Patches attached for all branches, including S2_6.
Split gtk4-client part -> #48634
Reply To cazfi
New patches for S3_1 - main attached to this ticket, with gtk4-client part removed.
Pushed to branches other than S3_1 (will push there after beta3 release)
gtk-clients currently apply themes for the main window only. It should be applied to all freeciv dialogs (and widgets)