window: Warn if try to focus unmanaging windows

GNOME/mutter!307
4 jobs for !307 with workspace-use-focusable-ancestor in 5 minutes and 15 seconds
detached
Status Job ID Name Coverage
  Review
passed #314805
check-commit-log

00:00:26

 
  Build
passed #314806
build-mutter

00:01:47

 
  Test
passed #314808
can-build-gnome-shell

00:01:31

passed #314807
test-mutter

00:03:01