gtk:widget-add-mnemonic-label (widget label)

widget -- a gtk:widget object
label -- a gtk:widget object that acts as a mnemonic label for widget

Adds a widget to the list of mnemonic labels for this widget. See the gtk:widget-list-mnemonic-labels function for a list of mnemonic labels for this widget.

Note the list of mnemonic labels for the widget is cleared when the widget is destroyed, so the caller must make sure to update its internal state at this point as well.