window 
using the given style and state and shadow type, leaving a 
gap in one side.
WARNING: gtk_draw_shadow_gap has been deprecated since version 2.0 and should not be used in newly-written code. Use gtkPaintShadowGap instead.
gtkDrawShadowGap(object, window, state.type, shadow.type, x,  y, width, height, gap.side, gap.x, gap.width)objectGtkStylewindowstate.typeshadow.typexywidthheightgap.sidegap.xgap.width