[gnome-shell] windowManager: Fix windows not getting undimmed while hidden

[Rui Matos <rtcm src gnome org>]

commit 02a51bfa65528afd7ef2c72c7343ef583ebb6851
Author: Rui Matos <tiagomatos gmail com>
Date:   Mon Aug 22 19:53:38 2016 +0200

    windowManager: Fix windows not getting undimmed while hidden
    
    Mutter's plugin destroy event doesn't happen if a window is hidden
    when it gets unmanaged so we also need to handle the
    MetaWindow::unmanaged signal to check whether the parent should
    dimmed.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=752524

 js/ui/windowManager.js |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/js/ui/windowManager.js b/js/ui/windowManager.js
index 5222b98..8b0398b 100644
--- a/js/ui/windowManager.js
+++ b/js/ui/windowManager.js
@@ -1424,6 +1424,11 @@ const WindowManager = new Lang.Class({
 
             actor._windowType = type;
         }));
+        actor.meta_window.connect('unmanaged', Lang.bind(this, function(window) {
+                let parent = window.get_transient_for();
+                if (parent)
+                    this._checkDimming(parent);
+        }));
 
         if (actor.meta_window.is_attached_dialog())
             this._checkDimming(actor.get_meta_window().get_transient_for());