R0 = reason code
R0 = 0 => R1 = pointer to icon block
R2 = window handle
R0 = 1 => R1 = pointer to block:
R1 + 0 Minimum work area x coordinate
R1 + 4 Minimum work area y coordinate
R1 + 8 Maximum work area x coordinate
R1 + 12 Maximum work area y coordinate
R1 + 16 Border type
R2 = window handle
Like Wimp_PlotIcon, except it just redraws the 3D
border. If R0 is 1 on entry then an alternative block
is used as specified.
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