GestureMultiPress is a Gesture implementation able to
recognize multiple clicks on a nearby zone, which can be listened for through the
pressed signal.
Whenever time or distance between clicks exceed the GTK+ defaults, stopped
is emitted, and the click counter is reset.
Callers may also restrict the area that is considered valid for a >1 touch/button press through
set_area, so any click happening outside that area is considered to be a
first click of its own.
If rect is non-null,
the press area will be checked to be confined within the rectangle, otherwise the button count will be reset so the press is seen as
being the first one.