discardCachedImage

Stores the window’s raster image from a given rectangle expressed in the window’s base coordinate system.

Splices the window’s cached image rectangles, if any, back into its raster image (and buffer if it has one), undoing the effect of any drawing performed within those areas since they were established using cacheImageInRect:.

Passes a display message down the window’s view hierarchy, thus redrawing all views within the window, including the frame view that draws the border, title bar, and other peripheral elements.