I have still no concreate idea about this message from my Nim editor ht tps://github.com/ngtk3/NEd Gdk-CRITICAL **: gdk_window_move_resize_internal: assertion 'GDK_IS_WINDOW (window)' failed I get that message for GTK 3.18 when I launch the editor from the command line with two file arguments, and then use HSplit or VSplit from gears menu. But only when automatic scrollbars with overlay are selected in preferences. That is the default. No idea. I tried some hours to modify my code, but no change. Is that a known bug of GTK 3.18? Well, gedit seems to have it not, so there may be a way to suppress it. Google told me that it may be related to the realize functions, but that does not really help me removing that problem. _______________________________________________ gtk-list mailing list gtk-list@xxxxxxxxx https://mail.gnome.org/mailman/listinfo/gtk-list