[gnome-shell] overviewControls: Fix initial slide-in animation

[Florian Müllner <fmuellner src gnome org>]

commit e60bf44c2e06d7aecaba2803bf48e53bc47a6ce3
Author: Florian Müllner <fmuellner gnome org>
Date:   Sun Aug 31 02:18:51 2014 +0200

    overviewControls: Fix initial slide-in animation
    
    Controls are slided in by animating translationX from the actor's
    width to 0; however as _updateTranslation() will skip the animation
    when the property is already at its target value and 0 happens to be
    the initial value of translationX, the initial animation is skipped.
    Fix this by initializing translationX to undefined, which will always
    differ from a valid target value.

 js/ui/overviewControls.js |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/js/ui/overviewControls.js b/js/ui/overviewControls.js
index 9fe1dfd..4bd3d67 100644
--- a/js/ui/overviewControls.js
+++ b/js/ui/overviewControls.js
@@ -36,7 +36,7 @@ const SlideLayout = new Lang.Class({
 
     _init: function(params) {
         this._slideX = 1;
-        this._translationX = 0;
+        this._translationX = undefined;
         this._direction = SlideDirection.LEFT;
 
         this.parent(params);