In a group of multiple check buttons, only one button can be active
at a time. The behavior of a checkbutton in a group is also commonly
known as a *radio button*.
Setting the group of a check button also changes the css name of the
indicator widget's CSS node to 'radio'.
Setting up groups in a cycle leads to undefined behavior.
Note that the same effect can be achieved via the gtk.actionable.Actionable
API, by using the same action with parameter type and state type 's'
for all buttons in the group, and giving each button its own target
value.
Adds self to the group of group.
In a group of multiple check buttons, only one button can be active at a time. The behavior of a checkbutton in a group is also commonly known as a *radio button*.
Setting the group of a check button also changes the css name of the indicator widget's CSS node to 'radio'.
Setting up groups in a cycle leads to undefined behavior.
Note that the same effect can be achieved via the gtk.actionable.Actionable API, by using the same action with parameter type and state type 's' for all buttons in the group, and giving each button its own target value.