=> R2 = source minx (incl)
R3 = miny (incl)
R4 = maxx (excl)
R5 = maxy (excl)
R6 = destination minx (incl)
R7 = miny (incl)
R6 = maxx (excl)
R7 = maxy (excl)
R10 = window handle - 1 [Wimp 3.90+]
R12 = value of R2 when filter registered
<= R0, R1, R3-R10 preserved
This code is called when the Wimp is about to copy a rectangle across the screen. The current and previous graphics cursors describe the area to be copied, but the operation has not yet been performed.
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