I hope you're fixed the window borders when using high DPI (e.g. 200%).

They have gaps between the window edge and the window shadow, where parts of other windows show through. Different parts of the edges are 2px wide while others -- even on the same edge of the window -- are 1px wide. Sometimes parts of an edge change width or develop holes when the window is active or inactive.

I've been joking for the last year that you seem to have given graphics work to people who don't know how to draw basic rectangles. :)

There are other high DPI issues, some at the API level, but those are the most obvious that I can't believe anyone let out the door. It'd be great if MS had more attention to detail, given this is a product used by millions of people. And if it didn't take a year for things to get fixed.