Style
Update group when it changes

Or the layers index out of bounds and you crash!
Improve haxwindow matching.
Be graceful and communicative if a haxWindow can't be found.
Some filtering fixes, plus some regression tests
Decruftify
Backup index calculation when we lost the window update race.
Update the collection view's frame on display for multi-monitor setups.
Add a bit of sophistication to more gracefully handle rapid use/abuse.
Wishful thinking.
Redundant