[gnome-shell] altTab: make thumbnails scroll to right if needed at first Alt+Shift+Above_Tab

[Rui Matos <rtcm src gnome org>]

commit 28bb0c1fb2fe6e8f8f6560fe885af46a13d37e6f
Author: Rui Matos <tiagomatos gmail com>
Date:   Thu Jul 21 18:58:43 2011 +0100

    altTab: make thumbnails scroll to right if needed at first Alt+Shift+Above_Tab
    
    Force an allocation at thumbnails creation so we can figure out whether we
    need to scroll when selecting.
    
    We also need to show() the whole AltTabPopup before calling _select() so that,
    when computing the scrolling offset, the widgets already have their styles
    loaded. Otherwise we will miss the switcher list item container's spacing.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=655069

 js/ui/altTab.js |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/js/ui/altTab.js b/js/ui/altTab.js
index 0d2ae39..cbe6f6c 100644
--- a/js/ui/altTab.js
+++ b/js/ui/altTab.js
@@ -147,6 +147,8 @@ AltTabPopup.prototype = {
 
         // Need to force an allocation so we can figure out whether we
         // need to scroll when selecting
+        this.actor.opacity = 0;
+        this.actor.show();
         this.actor.get_allocation_box();
 
         // Make the initial selection
@@ -186,7 +188,7 @@ AltTabPopup.prototype = {
         // disturbed by the popup briefly flashing.
         this._initialDelayTimeoutId = Mainloop.timeout_add(POPUP_DELAY_TIMEOUT,
                                                            Lang.bind(this, function () {
-                                                               this.actor.show();
+                                                               this.actor.opacity = 255;
                                                                this._initialDelayTimeoutId = 0;
                                                            }));
 
@@ -479,6 +481,10 @@ AltTabPopup.prototype = {
 
         this.actor.add_actor(this._thumbnails.actor);
 
+        // Need to force an allocation so we can figure out whether we
+        // need to scroll when selecting
+        this._thumbnails.actor.get_allocation_box();
+
         this._thumbnails.actor.opacity = 0;
         Tweener.addTween(this._thumbnails.actor,
                          { opacity: 255,