R0 = movement type:
0 = scroll window minimum amount necessary
1 = centre icon in window (only if it's currently outside the window)
2 = choose 0 or 1 depending on how far outside the window the icon is
R2 = window handle (or -1 for caret window and icon)
R3 = icon handle (if R2<>-1)
Checks to see if the specified icon is in the portion of the window which
is visible on the screen, and scrolls the window to display it if it
isn't. If R2=-1 then the icon containing the caret (if if belongs to your
task) is used. R0=2 is the recommended movement type to use.
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