LibWeb/IDB: Implement IDBIndex::getAll

Author: https://github.com/stelar7
Commit: 3fa1d1299c
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4727
Reviewed-by: https://github.com/gmta ✅
Reviewed-by: https://github.com/shannonbooth

Libraries/LibWeb/IndexedDB/Internal/Index.cpp

@@ -83,4 +83,18 @@ Optional<IndexRecord&> Index::first_in_range(GC::Ref<IDBKeyRange> range)
     });
 }
 
+GC::ConservativeVector<IndexRecord> Index::first_n_in_range(GC::Ref<IDBKeyRange> range, Optional<WebIDL::UnsignedLong> count)
+{
+    GC::ConservativeVector<IndexRecord> records(range->heap());
+    for (auto const& record : m_records) {
+        if (range->is_in_range(record.key))
+            records.append(record);
+
+        if (count.has_value() && records.size() >= *count)
+            break;
+    }
+
+    return records;
+}
+
 }