Cursors lose their absolute x position when they go off screen.

[samkristoff]

If you place a cursor on the instrument panel chart and then pan or zoom until the cursor should move off the screen it clips to the side of the screen. This is intended. However when you pan or zoom so that the cursor should be on screen again they are no longer in the correct x axis position. The cursor will now have the X axis position of the edge of the screen when they hit it.

Cursors pan and zoom as intended as long as they remain 'on screen' the entire time.

We should update cursors to remember their x axis value even when off screen and visually clip the cursor so it cannot go off screen but will return to it's true position if that position comes back on screen.