Adds gesture to the same group than group_gesture.
Gestures are by default isolated in their own groups.
Both gestures must have been added to the same widget before
they can be grouped.
When gestures are grouped, the state of GdkEventSequences
is kept in sync for all of those, so calling
gtk.gesture.Gesture.setSequenceState, on one will transfer
the same value to the others.
Adds gesture to the same group than group_gesture.
Gestures are by default isolated in their own groups.
Both gestures must have been added to the same widget before they can be grouped.
When gestures are grouped, the state of GdkEventSequences is kept in sync for all of those, so calling gtk.gesture.Gesture.setSequenceState, on one will transfer the same value to the others.
Groups also perform an "implicit grabbing" of sequences, if a gdk.event_sequence.EventSequence state is set to gtk.types.EventSequenceState.Claimed on one group, every other gesture group attached to the same gtk.widget.Widget will switch the state for that sequence to gtk.types.EventSequenceState.Denied.