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The method is deprecated, and according to docs should just not be used: https://docs.gtk.org/gtk3/method.Window.set_wmclass.html
The docs suggest gtk_window_set_role(), but AFAICS this is only helpful if one want to place the window in a certain position when restarting a session. I assume we don't want/need that.
This might also resolve this test failure #27766 (comment) - t.b.c.