Fix medium-copy-area between pixmaps - we need a graphics context, but none of the medium-gcontext methods apply to pixmaps, so create one using the medium of sheet associated with the destination pixmap.
Fix medium-copy-area between pixmaps - we need a graphics context, but
none of the medium-gcontext methods apply to pixmaps, so create one
using the medium of sheet associated with the destination pixmap.

quek/mcclim,quek/mcclim,informatimago/mcclim,informatimago/mcclim