[gnome-shell/T27795: 79/138] Allow going back to the icon grid clicking outside any window

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit fd43899094e7613925e0559397228e4e7a660225
Author: Mario Sanchez Prada <mario endlessm com>
Date:   Fri Jun 9 13:31:46 2017 +0100

    Allow going back to the icon grid clicking outside any window
    
    This enables the behaviour that takes you back to the APPs view
    by clicking in the desktop, outside any open window.

 js/ui/layout.js | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)
---
diff --git a/js/ui/layout.js b/js/ui/layout.js
index f57011a2a6..ca5bd8630b 100644
--- a/js/ui/layout.js
+++ b/js/ui/layout.js
@@ -1,7 +1,7 @@
 // -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
 /* exported MonitorConstraint, LayoutManager */
 
-const { Clutter, Gio, GLib, GObject, Meta, Shell, St } = imports.gi;
+const { Clutter, Gdk, Gio, GLib, GObject, Meta, Shell, St } = imports.gi;
 const Signals = imports.signals;
 
 const Background = imports.ui.background;
@@ -347,7 +347,16 @@ var LayoutManager = GObject.registerClass({
     }
 
     _addBackgroundMenu(bgManager) {
-        BackgroundMenu.addBackgroundMenu(bgManager.backgroundActor, this);
+        let clickAction = new Clutter.ClickAction();
+        bgManager.backgroundActor.add_action(clickAction);
+
+        BackgroundMenu.addBackgroundMenuForAction(clickAction, this);
+
+        clickAction.connect('clicked', action => {
+            let button = action.get_button();
+            if (button == Gdk.BUTTON_PRIMARY)
+                Main.overview.showApps();
+        });
     }
 
     _createBackgroundManager(monitorIndex) {