https://discourse.gnome.org/t/how-to-detect-a-double-click-of-a-gtktogglebutton-in-gtk4/32900
How to detect a double-click of a GtkToggleButton in gtk4? - Development - GNOME Discourse
Dec 5, 2025 - The obvious solution is to attach a GtkGestureClick, but it never receives the double click event, because the event sequence is claimed by the GtkGestureClick...
https://mail.gnome.org/archives/gtk-list/2003-May/msg00170.html
Re: how to use gtk_label_set_markup with the label of a GtkToggleButton
how to use