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Dragboxes can now be clipped by and/or fixed to a given window's work area
SWI Wimp_AutoScroll implemented
Ursula icon highlighting scheme redesigned

Bugfixes:
Wimp_Extend 11 now performs the same check on R1 as the main SWI handling code
Message blocks now updated if in a dynamic area
Screenblanker now turned off when error box is displayed
ptr_double now turned off when a drag starts