window: Warn if try to focus unmanaging windows

GNOME/mutter!307
4 jobs for !307 with workspace-use-focusable-ancestor in 6 minutes and 27 seconds
detached
Status Job ID Name Coverage
  Review
passed #330015
check-commit-log

00:00:23

 
  Build
passed #330016
build-mutter

00:02:38

 
  Test
passed #330018
can-build-gnome-shell

00:01:32

passed #330017
test-mutter

00:03:26