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
gtk.widget.Widget.queueResize instead of gtk.widget.Widget.queueDraw).
Deprecated: The #GtkRequisition 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 gtk.widget.Widget.queueResize instead of gtk.widget.Widget.queueDraw).
Normally, gtk.widget.Widget.sizeRequest should be used.