This function should only be used by widget implementations in
order to figure whether the widget’s requisition has actually
changed after some internal state change (so that they can call
Widget.queueResize instead of Widget.queueDraw).
Deprecated: The gtk.Requisition cache on the widget was
removed, If you need to cache sizes across requests and allocations,
add an explicit cache to the widget in question instead.
Retrieves the widget’s requisition.
This function should only be used by widget implementations in order to figure whether the widget’s requisition has actually changed after some internal state change (so that they can call Widget.queueResize instead of Widget.queueDraw).
Normally, Widget.sizeRequest should be used.