I think this is fixed in Gnome 3.28 (Ubuntu 18.04). Can anyone else confirm?
** Changed in: gnome-shell (Ubuntu) Status: Triaged => Incomplete -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1723554 Title: Highlight border flickers in Overview when you hover mouse away from & over window To manage notifications about this bug go to: https://bugs.launchpad.net/gnome-shell/+bug/1723554/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs