R1 = pointer to block:
R1 + 0 visible area minimum x coordinate
R1 + 4 visible area minimum y coordinate
R1 + 8 visible area maximum x coordinate
R1 + 12 visible area maximum y coordinate
R1 + 28 window flags
Exit:
Block contains altered coordinates
This call shifts the y coordinates in the supplied
block so that the window described would be
centred vertically on the screen. Usage ame as
WimpExt_CentreWindow.
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