#208 FBR00118M preview render window position bug

[Dan White]

osx beta 1401

when add camera track the window pane split os too high so you cant see the
camera track or click it properly.

when you move the pane split down the
rendner preview window does not move down
as it should,
and the mouse interacts with it as if it had actually moved down,
so you dont click where you see the pointer.

pane split should move down to accommodate new track automatically?
render preview window should follow pane split move.