=> R0 = window handle
R1 = pointer to block
+0 new workarea min x
+4 new workarea min y
+8 new workarea max x
+12 new workarea max y
<= R0 corrupt
Visible workarea must be wholly within new workarea extent.
On RISC OS 2 workarea extent must correspond to a whole number of pixels, or strange effects may occur. Later Wimps round the values.
See PRM 3, page 164.
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