$ snap run jdim
Mon Dec 27 22:47:10 2021 (ER 0) : SmcOpenConnection failed.

(jdim:1477): Gtk-WARNING **: 22:47:12.999: Allocating size to gtkmm__GtkWindow 0x5615501002a0 without calling gtk_widget_get_preferred_width/height(). How does the code know the size to allocate?

これらのメッセージはどうすんの？