another teaser owo

This is actually showing a new thing compared to what we had a year ago and compared to @brainblasted@crab.garden's recent screenshots - treeview and about dialog links update properly, previously they didn't - this required a bunch of fixes in GTK and an awful workaround in libadwaita because I didn't want to deal with treeview code (it's deprecated anyway, one more reason to move away from it)