=> R2 = task handle
R6 = minimum x
R7 = minimum y
R8 = maximum x
R9 = maximum y
R10 = window handle - 1
R12 = value of R2 when filter registered
<= all registers preserved
This is called after the window background is filled, before Wimp_GetRectangle returns, unless the call is returning with 'no more to do' status. This is not called due to Wimp_UpdateWindow since it does not fill the background, but is is called after a transparent window would have been filled.
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