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GtkImageMenuItem always packs a GtkImage when it is synced with a related action. This is unnecessary when the action doesn't have an icon set and results in excess padding when a GtkImageMenuItem is put in a menu bar (GtkUIManager does this). Fix this by not creating the GtkImage for icon-less actions. https://bugzilla.gnome.org/show_bug.cgi?id=742181
931a479d