Needs:
- A fast way to zoom-in on the image area encompassing the endpoints. Perhaps a button next to the horizon tool’s “preview” “reset”.
- A way to move the endpoints to a location in the area being zoomed-in
** For example right-clicking on the horizon line, in the left area of a zoomed-in image, would bring the left endpoint there;
** similarly, right-clicking on the horizon line, in the right area of a zoomed-in image, would bring the right endpoint there.