Projections default range settings

[pwalczysko]

When the projection button is clicked, a range of z planes is auto-selected which has a centre around the position of the knob which it was in before the projection button was clicked.

But, when the projection button is clicked, unclicked and clicked again, a surprising changes in the default range are happening.

Just by clicking and unclicking the projection, as the projection is unclicked, the z slider knob moves downwards on the non-projected image display. After couple of clicks and unclicks of the projection button, the default range "moves" completely to the bottom part of the z sections stack. But the user did not actively move the knobs on the slider.