Snapping windows to monitor halves / quadrants revisited

Snapping windows to monitor halves / quadrants revisited

In my last post I talked about snapping windows to monitor halves and quadrants. I have been using that code for a few days and found it has a few shortcomings
http://blog.dummzeuch.de/2016/06/18/snapping-windows-to-monitor-halves-quadrants-revisited/