[searchEntry] Correct some erroneous hover states

As the search entry captures the pointer when activated, the hover
state is not updated properly when the activation is cancelled
(either by clicking outside the entry or by hitting Escape).
Update the state manually in these cases.

https://bugzilla.gnome.org/show_bug.cgi?id=611095

js/ui/dash.js

@@ -230,6 +230,14 @@ SearchEntry.prototype = {
     },
 
     reset: function () {
+        let [x, y, mask] = global.get_pointer();
+        let actor = global.stage.get_actor_at_pos (Clutter.PickMode.REACTIVE,
+                                                   x, y);
+        // this.actor is never hovered directly, only its clutter_text and icon
+        let hovered = this.actor == actor.get_parent();
+
+        this.actor.set_hover(hovered);
+
         this.entry.text = '';
         global.stage.set_key_focus(null);
         this.entry.set_cursor_visible(true);