=> R0 = window handle, -2 for iconbar, or -1 for absolute co-ordinates
R1 = minimum x
R2 = minimum y
R3 = maximum x
R4 = maximum y
<= R0 corrupted
This SWI marks area of screen as invalid, and to be redrawn later. If you are doing some kind of animation, or other temporary changes, then you should use Wimp_UpdateWindow instead.
Coordinates are relative to the window's work area, unless R0 is -1 on entry in which case absolute screen coordinates are given.
Under the nested Wimp it is possible to force a redraw of windows which do not belong to the application, and an extended version is available.
See PRM 3, page 150.
Wimp_ForceRedraw (nested version)
=> R0 = window handle
R1 = "TASK" (&4B534154)
R2 = 3 - update the title bar
This call is the best way to force a redraw of the window's title bar, when available.
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