gtkPaintShadowGap: gtkPaintShadowGap
In RGtk2: R Bindings for Gtk 2.8.0 and Above

Draws a shadow around the given rectangle in window using the given style and state and shadow type, leaving a gap in one side.

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gtkPaintShadowGap(object, window, state.type, shadow.type, area = NULL, 
    widget = NULL, detail = NULL, x, y, width, height, gap.side, 
    gap.x, gap.width)

`object`	a `GtkStyle`
`window`	a `GdkWindow`
`state.type`	a state
`shadow.type`	type of shadow to draw
`area`	clip rectangle, or `NULL` if the output should not be clipped. [ allow-none ]
`widget`	the widget. [ allow-none ]
`detail`	a style detail. [ allow-none ]
`x`	x origin of the rectangle
`y`	y origin of the rectangle
`width`	width of the rectangle
`height`	width of the rectangle
`gap.side`	side in which to leave the gap
`gap.x`	starting position of the gap
`gap.width`	width of the gap