On Mon, 2018-06-25 at 23:20 +0200, Rafal Luzynski wrote: > I assume this is your application or at least an application > for which you have the source code and you are going to fix it. That are some of our applications, and at least some of ours get such messages since at least one year, for example (evince:3250): Gtk-WARNING **: Allocating size to EvSidebar 0x55eab6d1b680 without calling gtk_widget_get_preferred_width/height(). How does the code know the size to allocate? There has been multiple complaints about that on this list, but it seems to be not really easy to debug. _______________________________________________ gtk-list mailing list gtk-list@xxxxxxxxx https://mail.gnome.org/mailman/listinfo/gtk-list