Don't move the fast scroll thumb with a list on overscroll.
diff --git a/core/java/android/widget/AbsListView.java b/core/java/android/widget/AbsListView.java
index 254efe7..a79bbee 100644
--- a/core/java/android/widget/AbsListView.java
+++ b/core/java/android/widget/AbsListView.java
@@ -2364,7 +2364,16 @@
     public void draw(Canvas canvas) {
         super.draw(canvas);
         if (mFastScroller != null) {
-            mFastScroller.draw(canvas);
+            final int scrollY = mScrollY;
+            if (scrollY != 0) {
+                // Pin the fast scroll thumb to the top/bottom during overscroll.
+                int restoreCount = canvas.save();
+                canvas.translate(0, (float) scrollY);
+                mFastScroller.draw(canvas);
+                canvas.restoreToCount(restoreCount);
+            } else {
+                mFastScroller.draw(canvas);
+            }
         }
     }