LibWeb/IDB: Implement retrieve_multiple_items_from_an_object_store

Author: https://github.com/stelar7
Commit: 839ffd45f3
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5385
Reviewed-by: https://github.com/gmta ✅

Libraries/LibWeb/IndexedDB/Internal/ObjectStore.cpp

@@ -103,4 +103,18 @@ GC::ConservativeVector<ObjectStoreRecord> ObjectStore::first_n_in_range(GC::Ref<
     return records;
 }
 
+GC::ConservativeVector<ObjectStoreRecord> ObjectStore::last_n_in_range(GC::Ref<IDBKeyRange> range, Optional<WebIDL::UnsignedLong> count)
+{
+    GC::ConservativeVector<ObjectStoreRecord> records(range->heap());
+    for (auto const& record : m_records.in_reverse()) {
+        if (range->is_in_range(record.key))
+            records.append(record);
+
+        if (count.has_value() && records.size() >= *count)
+            break;
+    }
+
+    return records;
+}
+
 }