[gnome-shell] overview: Remove stack actor

[Florian Müllner <fmuellner src gnome org>]

commit 5182129196074204bcfbc5bb21ae618d8f27dbc8
Author: Florian Müllner <fmuellner gnome org>
Date:   Fri Jun 24 15:45:03 2016 +0200

    overview: Remove stack actor
    
    The stack was used to overlay a message indicator over the overview
    group. That indicator is long gone, so there's no longer a need for
    an intermediate actor in the hierarchy.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=766883

 js/ui/overview.js |   18 ++++++------------
 1 files changed, 6 insertions(+), 12 deletions(-)
---
diff --git a/js/ui/overview.js b/js/ui/overview.js
index 89c6237..f839f08 100644
--- a/js/ui/overview.js
+++ b/js/ui/overview.js
@@ -107,18 +107,13 @@ const Overview = new Lang.Class({
 
         this._overviewCreated = true;
 
-        let layout = new Clutter.BinLayout();
-        this._stack = new Clutter.Actor({ layout_manager: layout });
-        this._stack.add_constraint(new LayoutManager.MonitorConstraint({ primary: true }));
-
         /* Translators: This is the main view to select
            activities. See also note for "Activities" string. */
         this._overview = new St.BoxLayout({ name: 'overview',
                                             accessible_name: _("Overview"),
                                             reactive: true,
-                                            vertical: true,
-                                            x_expand: true,
-                                            y_expand: true });
+                                            vertical: true });
+        this._overview.add_constraint(new LayoutManager.MonitorConstraint({ primary: true }));
         this._overview._delegate = this;
 
         // The main Background actors are inside global.window_group which are
@@ -149,8 +144,7 @@ const Overview = new Lang.Class({
         Main.layoutManager.overviewGroup.add_child(this._coverPane);
         this._coverPane.connect('event', Lang.bind(this, function (actor, event) { return 
Clutter.EVENT_STOP; }));
 
-        this._stack.add_actor(this._overview);
-        Main.layoutManager.overviewGroup.add_child(this._stack);
+        Main.layoutManager.overviewGroup.add_child(this._overview);
 
         this._coverPane.hide();
 
@@ -552,8 +546,8 @@ const Overview = new Lang.Class({
         Meta.disable_unredirect_for_screen(global.screen);
         this.viewSelector.show();
 
-        this._stack.opacity = 0;
-        Tweener.addTween(this._stack,
+        this._overview.opacity = 0;
+        Tweener.addTween(this._overview,
                          { opacity: 255,
                            transition: 'easeOutQuad',
                            time: ANIMATION_TIME,
@@ -618,7 +612,7 @@ const Overview = new Lang.Class({
         this.viewSelector.animateFromOverview();
 
         // Make other elements fade out.
-        Tweener.addTween(this._stack,
+        Tweener.addTween(this._overview,
                          { opacity: 0,
                            transition: 'easeOutQuad',
                            time: ANIMATION_TIME,