Gets the size request that was explicitly set for the widget using
gtkWidgetSetSizeRequest. A value of -1 stored in
height indicates that that dimension has not been set explicitly
and the natural requisition of the widget will be used intead. See
gtkWidgetSetSizeRequest. To get the size a widget will
actually use, call
gtkWidgetSizeRequest instead of
A list containing the following elements:
(out): return location for width, or
(out): return location for height, or
Derived by RGtkGen from GTK+ documentation
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