From 9234261afe58dbfe8b1e0c6b9c2947e7e183cd22 Mon Sep 17 00:00:00 2001
From: Jake Macdonald <jakemac@google.com>
Date: Thu, 24 Oct 2024 21:05:55 +0000
Subject: [PATCH] add a hack for lists in the LazyMergedMapView

---
 pkgs/dart_model/lib/src/lazy_merged_map.dart | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/pkgs/dart_model/lib/src/lazy_merged_map.dart b/pkgs/dart_model/lib/src/lazy_merged_map.dart
index 7e92f081..4e1815c3 100644
--- 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');
         }