GtkToggleButton: You can untoggle all buttons in a group
Since GTK 4 GtkToggleButton
s can be grouped. Clicking an inactive button will deactivate the active button in the group, but you can still click the active button to deactivate it, leaving the group with no active button.
This defeats the point of grouping a bit, mimicking the behavior of GtkCheckButton
(which has strictly one active button in a group) would be more useful and more intuitive.