Interestingly I've found the same 1px windows when working on Xmir recently (no compiz/unity involved). Although on the Xorg server side they are usually flagged as invisible so are not meant to be displayed.
Interestingly I've found the same 1px windows when working on Xmir recently (no compiz/unity involved). Although on the Xorg server side they are usually flagged as invisible so are not meant to be displayed.