int gdk_paintable_get_intrinsic_height ( GdkPaintable* paintable )
Gets the preferred height 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 gdk_paintable_snapshot().
paintable does not have a preferred height, it returns 0.
Negative values are never returned.