NON-WORKING STATE.  eew blech gross attempt at multiple previews rendering
Revert "NON-WORKING STATE.  eew blech gross attempt at multiple previews rendering"

This reverts commit 4cbba19c4b2ea54afdf374b9fde2192fd6a1c1d5.
beginnings of multipreview draw
made it a little easier to see which tracks are displaying
huzzah! she works! Now get back in there and clean up that code!
fixed update preview recomputes