add a hack for lists in the LazyMergedMapView

dart-lang · Oct 24, 2024 · 9234261 · 9234261
1 parent 0af4bd1
commit 9234261
Showing 1 changed file with 8 additions and 1 deletion.
diff --git a/pkgs/dart_model/lib/src/lazy_merged_map.dart b/pkgs/dart_model/lib/src/lazy_merged_map.dart
@@ -39,7 +39,14 @@ class LazyMergedMapView extends MapBase<String, Object?> {
             rightValue is Map<String, Object?>) {
           return LazyMergedMapView(leftValue, rightValue);
         }
-        if (leftValue != rightValue) {
+        if (leftValue is List<Object?> && rightValue is List<Object?>) {
+          if (leftValue.length != rightValue.length) {
+            throw StateError('Cannot merge lists of different lengths, '
+                'got $leftValue and $rightValue');
+          }
+          // TODO: Something better for lists, it isn't clear how to merge them.
+          return leftValue;
+        } else if (leftValue != rightValue) {
           throw StateError('Cannot merge maps with different values, and '
               '$leftValue != $rightValue');
         }