int get_intrinsic_width ( GdkPaintable* paintable )
Gets the preferred width the
paintable would like to be displayed at.
Consumers of this interface can use this to reserve enough space to draw the paintable.
This is a purely informational value and does not in any way limit the
values that may be passed to
paintable does not have a preferred width, it returns 0.
Negative values are never returned.