Merge "Scroll the hiding page to top on tab changed in sharesheet" into rvc-qpr-dev

core/java/com/android/internal/app/ChooserActivity.java

@@ -3134,6 +3134,7 @@ public class ChooserActivity extends ResolverActivity implements
         // ends up disabled. That's because at some point the old tab's vertical scrolling is
         // disabled and the new tab's is enabled. For context, see b/159997845
         setVerticalScrollEnabled(true);
+        mResolverDrawerLayout.scrollNestedScrollableChildBackToTop();
     }
 
     @Override

core/java/com/android/internal/widget/ResolverDrawerLayout.java

@@ -464,11 +464,7 @@ public class ResolverDrawerLayout extends ViewGroup {
                             smoothScrollTo(mCollapsibleHeight + mUncollapsibleHeight, yvel);
                             mDismissOnScrollerFinished = true;
                         } else {
-                            if (isNestedListChildScrolled()) {
-                                mNestedListChild.smoothScrollToPosition(0);
-                            } else if (isNestedRecyclerChildScrolled()) {
-                                mNestedRecyclerChild.smoothScrollToPosition(0);
-                            }
+                            scrollNestedScrollableChildBackToTop();
                             smoothScrollTo(yvel < 0 ? 0 : mCollapsibleHeight, yvel);
                         }
                     }
@@ -493,6 +489,17 @@ public class ResolverDrawerLayout extends ViewGroup {
         return handled;
     }
 
+    /**
+     * Scroll nested scrollable child back to top if it has been scrolled.
+     */
+    public void scrollNestedScrollableChildBackToTop() {
+        if (isNestedListChildScrolled()) {
+            mNestedListChild.smoothScrollToPosition(0);
+        } else if (isNestedRecyclerChildScrolled()) {
+            mNestedRecyclerChild.smoothScrollToPosition(0);
+        }
+    }
+
     private void onSecondaryPointerUp(MotionEvent ev) {
         final int pointerIndex = ev.getActionIndex();
         final int pointerId = ev.getPointerId(pointerIndex);