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Since we have a new mechanism for requesting sizes: GtkSizeRequestIface; it makes no sense to maintain this cache on the GtkWidget structure... removing the requisition cache however does not break the old "size-request" signal which is there for backwards compatability reasons. In any case widget->requisition should not have been accessed, gtk_widget_get_child_requisition() would have been the correct way to consult the cache. This commit also deprecates the newly added gtk_widget_get_requisition() API and makes it fallback on gtk_size_request_get_size().
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