#20 Logic error in buffer swap w/out visual

[Mike C. Fletcher]

Buffer is swapped even when there is no visual
rendering pass occuring (such as when only a mouse-
projection render is done). Need to track whether a
visual render has occured and decide whether to swap.

Causes a jitter effect (previous frame swapping in) on
slow machines (or with very complex scenes).

[Mike C. Fletcher]

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This is now fixed in 1.0a2