It would be nice with a pause button in the categories and collection view. That way one can work on a selection without experiencing that the focused image shifts each time the category tree or the collection recalculates (the window flickers).
The feature request is related to another I have, but perhaps this is a little easier to implement.
https://www.photools.com/community/index.php?topic=1656.0
I can see from earlier discussions on this "flickering window" that a pause button can be difficult to implement, but if you got the time at a later point to check it out that would be very nice.
Kim Abel
I thought that maybe a "HOLD SCREEN UPDATES" button would be workable.
One would need some indication to pop up when the screen isn't up-to-date any longer.
I do not know, how this could be solved, but it would be nice, one day have a good solution for this, because I had also some "problems" with this... well, problems... in fact this means simply I had to wait 8)