Fix the scrolling behavior in Settings homepage

- we always scroll to top of homepage first.
- if target position already exist on screen,
  we don't need to scroll.
- if target position doesn't exist on screen,
  scroll to the target position.

Bug: 349696107
Test: manual
Flag: com.android.settings.flags.homepage_revamp
Change-Id: I18c314d19eb38f22f799cb8bf087bf71f4f7d466

src/com/android/settings/widget/HighlightableTopLevelPreferenceAdapter.java

@@ -17,6 +17,7 @@
 package com.android.settings.widget;
 
 import android.content.Context;
+import android.graphics.Rect;
 import android.graphics.drawable.Drawable;
 import android.text.TextUtils;
 import android.util.Log;
@@ -212,6 +213,14 @@ public class HighlightableTopLevelPreferenceAdapter extends RoundCornerPreferenc
         // Scroll to the top to reset the position.
         mRecyclerView.nestedScrollBy(0, -mRecyclerView.getHeight());
 
+        // get the visible area of the recycler view
+        Rect rvRect = new Rect();
+        mRecyclerView.getGlobalVisibleRect(rvRect);
+        if (Flags.homepageRevamp() && view.getBottom() <= rvRect.height()) {
+            // the request position already fully visible in the visible area
+            return;
+        }
+
         final int scrollY = view.getTop();
         if (scrollY > 0) {
             mRecyclerView.nestedScrollBy(0, scrollY);