Commit 3171819c improved window cycling by using a dedicated to clone
for highlighting rather than activating all cycled windows. Original
window actors are hidden while its clone is showing, and shown again
afterwards, however the latter is wrong for actors that are not supposed
to be visible (for example where the window is minimized, or on a different
workspace). Fix this by properly syncing the actor's visibility instead
of showing it unconditionally.
https://bugzilla.gnome.org/show_bug.cgi?id=771536
d6a78d61d1