We don't use different hover- and focus indications for window previews,
so using keyboard navigation after hovering a clone often has surprising
results when the previous focus window wasn't the selected one. Address
this by simply moving the keyboard focus with the highlight.
https://bugzilla.gnome.org/show_bug.cgi?id=786546
if (this._hidden)
return;
+ this._windowClone.actor.grab_key_focus();
this._animateVisible();
this.emit('show-close-button');
},