gEDA-dev: PCB GTK HID Speedups (PATCH for testing / comment)

[Peter Clifton]

Here is a patch to greatly speed up move operations on complex boards.
(Might help more generally too).

Its not a clean patch (it comments Draw() calls rather removing them at
this stage, as I want / need someone more familiar with the drawing
architecture to verify / confirm why this works without hurting the
drawing.

The portion to queue pending redraws to an idle function helps and is
much more like the lesstif hid, although might hurt the feel of
responsiveness when zooming. (My idle function might not have enough
priority, or perhaps it needs to be combined with a maximum elapsed time
before drawing).

Attached.

-- 
Peter Clifton

Electrical Engineering Division,
Engineering Department,
University of Cambridge,
9, JJ Thomson Avenue,
Cambridge
CB3 0FA

Tel: +44 (0)7729 980173 - (No signal in the lab!)
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