📰 Fix card style when a neighbour is added or removed

chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/SuggestionsSection.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/SuggestionsSection.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/SuggestionsSection.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/SuggestionsSection.java
index 156bb65ee6dcc678dc30af589299af3b27a91409..15299e11e0f845d12fd94151717a4782d1483f00 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/SuggestionsSection.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/SuggestionsSection.java
@@ -255,6 +255,28 @@ public void onItemRangeRemoved(TreeNode child, int index, int count) {
     }
 
     @Override
+    protected void notifyItemRangeInserted(int index, int count) {
+        super.notifyItemRangeInserted(index, count);
+        notifyNeighbourModified(index, count);
+    }
+
+    @Override
+    protected void notifyItemRangeRemoved(int index, int count) {
+        super.notifyItemRangeRemoved(index, count);
+        notifyNeighbourModified(index, count);
+    }
+
+    private void notifyNeighbourModified(int index, int modifiedRange) {
+        int aboveNeighbour = index - 1;
+        int belowNeighbour = index + modifiedRange;
+
+        if (aboveNeighbour >= 0) notifyItemChanged(aboveNeighbour, PartialUpdateId.CARD_BACKGROUND);
+        if (belowNeighbour < getItemCount()) {
+            notifyItemChanged(belowNeighbour, PartialUpdateId.CARD_BACKGROUND);
+        }
+    }
+
+    @Override
     public void onBindViewHolder(NewTabPageViewHolder holder, int position) {
         super.onBindViewHolder(holder, position);
         childSeen(position);