[pd] gui redraw improved by holding down a random key

[hard off]

'blocky' = the the sqaure canvas is jumping about 50 pixels at a time,
stopping for 100ms or so, and then juming again.  if i hold down a
key, this blocky motion stops, and the square canvas slides 1 pixel at
a time.

i can't see why the screen refresh rate would have anything to do with
this problem.


there is definately a problem here.  i am not hallucinating!