get-clipping-region

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`get-clipping-region`

Gets the current rectangular clipping region. The clipping width and height are set to -1 if there is no current clipping region.

(send a-wx:dc get-clipping-region x y width height) -> void
    x : boxed inexact real
    y : boxed inexact real
    width : boxed inexact real
    height : boxed inexact real
The x box is set to the top-left location of the clipping region (in DC coordinates), etc.