Scroll to show WidgetCell when it is tapped.

Scroll to show WidgetCell when it is tapped in a widget sheet.
Otherwise, the add button may show/hide without the user seeing
it if the bottom is clipped.

Bug: 329861721
Test: manual- tap WidgetCell when top or bottom is scrolled out of view
Flag: ACONFIG com.android.launcher3.enable_widget_tap_to_add TEAMFOOD

Change-Id: Ie21730c193e845cb1c1fa447b7c0a7e719984a8f

src/com/android/launcher3/widget/WidgetsBottomSheet.java

@@ -28,6 +28,7 @@ import android.view.LayoutInflater;
 import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewGroup;
+import android.view.ViewParent;
 import android.view.animation.Interpolator;
 import android.widget.ScrollView;
 import android.widget.TableLayout;
@@ -282,4 +283,16 @@ public class WidgetsBottomSheet extends BaseWidgetSheet {
             float distanceToMove, Interpolator interpolator, PendingAnimation target) {
         target.addAnimatedFloat(mSwipeToDismissProgress, 0f, 1f, interpolator);
     }
+
+    @Override
+    protected void scrollCellContainerByY(WidgetCell wc, int scrollByY) {
+        for (ViewParent parent = wc.getParent(); parent != null; parent = parent.getParent()) {
+            if (parent instanceof ScrollView scrollView) {
+                scrollView.smoothScrollBy(0, scrollByY);
+                return;
+            } else if (parent == this) {
+                return;
+            }
+        }
+    }
 }