[gnome-shell] layout: fix initial struts

[Dan Winship <danw src gnome org>]

commit bf0bcaa30635c3af7cce9c7586654ba202dea2bd
Author: Dan Winship <danw gnome org>
Date:   Fri Sep 2 16:36:02 2011 -0400

    layout: fix initial struts
    
    The struts were being set while the panel was offscreen (starting its
    slide-in animation), and then belatedly getting fixed the next time
    something else caused a chrome update. Fix this by setting them before
    the animation, and freezing them during the animation.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=657986

 js/ui/layout.js |   26 ++++++++++++++++++++++++--
 1 files changed, 24 insertions(+), 2 deletions(-)
---
diff --git a/js/ui/layout.js b/js/ui/layout.js
index b03b7ab..a3fd4e1 100644
--- a/js/ui/layout.js
+++ b/js/ui/layout.js
@@ -250,14 +250,23 @@ LayoutManager.prototype = {
     },
 
     _startupAnimation: function() {
+        // Don't animate the strut
+        this._chrome.freezeUpdateRegions();
+
         this.panelBox.anchor_y = this.panelBox.height;
         Tweener.addTween(this.panelBox,
                          { anchor_y: 0,
                            time: STARTUP_ANIMATION_TIME,
-                           transition: 'easeOutQuad'
+                           transition: 'easeOutQuad',
+                           onComplete: this._startupAnimationComplete,
+                           onCompleteScope: this
                          });
     },
 
+    _startupAnimationComplete: function() {
+        this._chrome.thawUpdateRegions();
+    },
+
     showKeyboard: function () {
         Main.messageTray.hide();
         Tweener.addTween(this._bottomBox,
@@ -549,6 +558,8 @@ Chrome.prototype = {
 
         this._monitors = [];
         this._inOverview = false;
+        this._updateRegionIdle = 0;
+        this._freezeUpdateCount = 0;
 
         this._trackedActors = [];
 
@@ -744,11 +755,22 @@ Chrome.prototype = {
     },
 
     _queueUpdateRegions: function() {
-        if (!this._updateRegionIdle)
+        if (!this._updateRegionIdle && !this._freezeUpdateCount)
             this._updateRegionIdle = Mainloop.idle_add(Lang.bind(this, this.updateRegions),
                                                        Meta.PRIORITY_BEFORE_REDRAW);
     },
 
+    freezeUpdateRegions: function() {
+        if (this._updateRegionIdle)
+            this.updateRegions();
+        this._freezeUpdateCount++;
+    },
+
+    thawUpdateRegions: function() {
+        this._freezeUpdateCount--;
+        this._queueUpdateRegions();
+    },
+
     _updateFullscreen: function() {
         let windows = Main.getWindowActorsForWorkspace(global.screen.get_active_workspace_index());