Fix 2325492 - No icons in launcher after pressing home from within an app

It looks like the evil hack in 14f122bf84 to make the workspace
not animate didn't completely work.  The key to reproducing this bug is to make sure the
activity is destroyed and to have last gone to an app from a screen other than the center
screen, because that causes it to get reloaded from the icicle, which makes the timing
more amenable to missing the animation, because the view isn't attached yet.

src/com/android/launcher2/Workspace.java

@@ -272,6 +272,7 @@ public class Workspace extends ViewGroup implements DropTarget, DragSource, Drag
      * @param currentScreen
      */
     void setCurrentScreen(int currentScreen) {
+        if (!mScroller.isFinished()) mScroller.abortAnimation();
         clearVacantCache();
         mCurrentScreen = Math.max(0, Math.min(currentScreen, getChildCount() - 1));
         scrollTo(mCurrentScreen * getWidth(), 0);
@@ -946,10 +947,6 @@ public class Workspace extends ViewGroup implements DropTarget, DragSource, Drag
     }
 
     void snapToScreen(int whichScreen) {
-        snapToScreen(whichScreen, true);
-    }
-
-    void snapToScreen(int whichScreen, boolean animate) {
         //if (!mScroller.isFinished()) return;
 
         whichScreen = Math.max(0, Math.min(whichScreen, getChildCount() - 1));
@@ -973,8 +970,7 @@ public class Workspace extends ViewGroup implements DropTarget, DragSource, Drag
         final int delta = newX - mScrollX;
         final int duration = screenDelta * 300;
         awakenScrollBars(duration);
-        // 1ms is close to don't animate
-        mScroller.startScroll(mScrollX, 0, delta, 0, animate ? duration : 1);
+        mScroller.startScroll(mScrollX, 0, delta, 0, duration);
         invalidate();
     }
 
@@ -1425,7 +1421,11 @@ public class Workspace extends ViewGroup implements DropTarget, DragSource, Drag
     }
 
     void moveToDefaultScreen(boolean animate) {
-        snapToScreen(mDefaultScreen, animate);
+        if (animate) {
+            snapToScreen(mDefaultScreen);
+        } else {
+            setCurrentScreen(mDefaultScreen);
+        }
         getChildAt(mDefaultScreen).requestFocus();
     }