Fix scroll jump on update

 Bug: 3476420

Change-Id: I4c99c1925116309fdfa1a53c8569554a8c8b955a
diff --git a/src/com/android/browser/BrowserBookmarksPage.java b/src/com/android/browser/BrowserBookmarksPage.java
index 0c8298f..98b25a8 100644
--- a/src/com/android/browser/BrowserBookmarksPage.java
+++ b/src/com/android/browser/BrowserBookmarksPage.java
@@ -596,13 +596,17 @@
         switch (mCurrentView) {
         case VIEW_THUMBNAILS:
             mList.setAdapter(null);
-            mGrid.setAdapter(mAdapter);
+            if (mGrid.getAdapter() != mAdapter) {
+                mGrid.setAdapter(mAdapter);
+            }
             mGrid.setVisibility(View.VISIBLE);
             mList.setVisibility(View.GONE);
             break;
         case VIEW_LIST:
             mGrid.setAdapter(null);
-            mList.setAdapter(mAdapter);
+            if (mList.getAdapter() != mAdapter) {
+                mList.setAdapter(mAdapter);
+            }
             mGrid.setVisibility(View.GONE);
             mList.setVisibility(View.VISIBLE);
             break;