Many thanks for this!
Some display related things:
First, when objects are moved ‘through’ a clipping plane interactively, a confusing mix of the yellow selection wireframe, the object and the section surface is shown. It just doesn’t look right.
We should expect the object to look correctly clipped all the time when moving, not just after mouse up, right?
Second, something regarding clipping plane’s arrows and text: when changing the length of the clipping plane, their size should remain the same, not scale up or down!
And why are the ends of the clipping line suddenly… clipped when moving a control point?
Thanks!