scrollbar-area-box

Arguments: grid-widget section

Returns a box that indicates the region that the scrollbar of this grid-section occupies. This area is blank by default if the grid-section is not scrollable, and it may be useful to draw something else in this box in that case. The box is in the coordinates of the grid-widget's window (as returned by (window my-grid-widget)), and the drawing should be done on that window as well.

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Created 2015.5.21.