Fixes commons-app#3845 (Contributions list starts at the last uploaded pic, not the currently uploading one) (commons-app#3962)

* Fixes commons-app#3845

* Fixes commons-app#3845
*Scroll to the top when a new upload item is added in a contribution list

Author: ashishkumar468

app/src/main/java/fr/free/nrw/commons/contributions/ContributionsListFragment.java

@@ -22,6 +22,7 @@
 import androidx.fragment.app.FragmentManager;
 import androidx.recyclerview.widget.GridLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
+import androidx.recyclerview.widget.RecyclerView.AdapterDataObserver;
 import butterknife.BindView;
 import butterknife.ButterKnife;
 import com.google.android.material.floatingactionbutton.FloatingActionButton;
@@ -134,6 +135,15 @@ private void initRecyclerView() {
     contributionsListPresenter.setup();
     contributionsListPresenter.contributionList.observe(this.getViewLifecycleOwner(), adapter::submitList);
     rvContributionsList.setAdapter(adapter);
+    adapter.registerAdapterDataObserver(new AdapterDataObserver() {
+      @Override
+      public void onItemRangeInserted(int positionStart, int itemCount) {
+        super.onItemRangeInserted(positionStart, itemCount);
+        if (itemCount > 0 && positionStart == 0) {
+          rvContributionsList.scrollToPosition(0);//Newly upload items are always added to the top
+        }
+      }
+    });
   }
 
   private int getSpanCount(final int orientation) {