fix two crashes

* fix crash where Workspace gets an ACTION_MOVE
but didn't get the ACTION_DOWN before it
* fix crash in DimmableBubbleTextView on
non-xlarge devices (buganizer bug#3001211)

Change-Id: I419b4a9fd3c95df9949f1d46746845ad2dc4b831

src/com/android/launcher2/PagedView.java

@@ -545,15 +545,21 @@ public abstract class PagedView extends ViewGroup {
             return true;
         }
 
-
         switch (action & MotionEvent.ACTION_MASK) {
             case MotionEvent.ACTION_MOVE: {
                 /*
                  * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check
                  * whether the user has moved far enough from his original down touch.
                  */
-                determineScrollingStart(ev);
-                break;
+                if (mActivePointerId != INVALID_POINTER) {
+                    determineScrollingStart(ev);
+                    break;
+                }
+                // if mActivePointerId is INVALID_POINTER, then we must have missed an ACTION_DOWN
+                // event. in that case, treat the first occurence of a move event as a ACTION_DOWN
+                // i.e. fall through to the next case (don't break)
+                // (We sometimes miss ACTION_DOWN events in Workspace because it ignores all events
+                // while it's small- this was causing a crash before we checked for INVALID_POINTER)
             }
 
             case MotionEvent.ACTION_DOWN: {