This function is only for use in widget implementations. Obtains geometry on the widget (e.g. with gtk_widget_set_size_request()), in which case it returns that geometry instead of the widget's requisition. This function differs from gtk_widget_size_request() in that it retrieves the last size request value from @widget->requisition, while gtk_widget_size_request() actually calls the "size_request" method on @widget to compute the size request and fill in @widget->requisition, and only then returns @widget->requisition. Because this function does not call the "size_request" method, it can only be used when you know that @widget->requisition is up-to-date, that is, gtk_widget_size_request() has been called since the last time a resize was queued. In general, only container implementations have this information; applications should use gtk_widget_size_request().