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Detail:
  Taskwindow sits of BYTEV and waits for n*2 Vsyncs when INKEY(n) is called.
This isn't quite correct as VSyncs aren't a reliable timing source, however,
leaving that aside for the moment, what Taskwindow was doing was sitting on
Null events until it read that enough Vsyncs had passed, thus eating up CPU
time.

  The new behaviour is to call Wimp_PollIdle instead, which should also
correct the amount of time waited for.  This behaviour can be toggled with
the build switch PollIdleHandling.

Admin:
  Lightly tested on a RPC.  Using AppStat, no call were made to the
taskwindow during and INKEY, whereas they were previously.


Version 0.66. Tagged as 'TaskWindow-0_66'