R0 = window handle
R1 = pointer to block
R1+00 = New work area minimum x
R1+04 = New work area minimum y
R1+08 = New work area maximum x
R1+12 = New work area maximum y
Sets the work area extent of the
specified window, altering the values
to be whole pixels, and reopening the
window (if already open) so that the
change is reflected on the screen.
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