1 files changed, 28 insertions, 0 deletions
diff --git a/LibMatrix/Extensions/EnumerableExtensions.cs b/LibMatrix/Extensions/EnumerableExtensions.cs
new file mode 100644
index 0000000..d9619b7
--- /dev/null
+++ b/LibMatrix/Extensions/EnumerableExtensions.cs
@@ -0,0 +1,28 @@
+namespace LibMatrix.Extensions;
+
+public static class EnumerableExtensions {
+    public static void MergeStateEventLists(this List<StateEvent> oldState, List<StateEvent> newState) {
+        foreach (var stateEvent in newState) {
+            var old = oldState.FirstOrDefault(x => x.Type == stateEvent.Type && x.StateKey == stateEvent.StateKey);
+            if (old is null) {
+                oldState.Add(stateEvent);
+                continue;
+            }
+            oldState.Remove(old);
+            oldState.Add(stateEvent);
+        }
+    }
+
+    public static void MergeStateEventLists(this List<StateEventResponse> oldState, List<StateEventResponse> newState) {
+        foreach (var stateEvent in newState) {
+            var old = oldState.FirstOrDefault(x => x.Type == stateEvent.Type && x.StateKey == stateEvent.StateKey);
+            if (old is null) {
+                oldState.Add(stateEvent);
+                continue;
+            }
+            oldState.Remove(old);
+            oldState.Add(stateEvent);
+        }
+    }
+
+}