AllSync & AllDup

I was just running a nasty, long scan of ~300,000 8,192-byte files (which means millions of comparisons). After ~30 minutes, it was ~20% complete when I tried to minimize the window. Unfortunately, I accidentally clicked the [x] button instead of the [_] button, and the scan was promptly aborted and the whole process was wasted and had to be restarted all over again from scratch.

There definitely needs to be a prompt when aborting a scan.

I will note this at the ToDo-List. Thanks for the feedback!