wire_v0.7.4• I think I've cracked it. that is, intelligent directory handling. the drag-n-send™ window will now check some things for you, like whether a folder is empty (no point going in if it is), and will (fingers crossed) back up to the correct folder when you go "up" again, and again, and again. pretty cool.
I spent an age debugging what turned out to be a silly error on my part; time well spent; what we've ended up with is way smarter and much smaller (code-wise) than the old viewer.