improve creation of editSource

lib/controllers/room_chat_controller.dart

@@ -54,7 +54,10 @@ class RoomChatController extends AsyncNotifier<IList<Event>?> {
 
           return editedEvent == null
               ? foundEvent
-              : foundEvent?.copyWith(content: editedEvent.content);
+              : foundEvent?.copyWith(
+                  content: editedEvent.content,
+                  localContent: editedEvent.localContent,
+                );
         })
         .nonNulls
         .toIList();

lib/widgets/composer/composer.dart

@@ -5,6 +5,7 @@ import "package:flutter_hooks/flutter_hooks.dart";
 import "package:fluttertagger/fluttertagger.dart";
 import "package:hooks_riverpod/hooks_riverpod.dart";
 import "package:nexus/controllers/power_level_controller.dart";
+import "package:nexus/models/content/message.dart";
 import "package:nexus/models/event.dart";
 import "package:nexus/models/relation_type.dart";
 import "package:nexus/widgets/composer/mention_overlay.dart";
@@ -42,7 +43,12 @@ class Composer extends HookConsumerWidget {
     final query = useState("");
 
     if (relationType == .edit && controller.value.text.isEmpty) {
-      controller.value.text = relatedEvent?.localContent?.editSource ?? "";
+      controller.value.text =
+          relatedEvent?.localContent?.editSource ??
+          switch (relatedEvent?.content) {
+            TextMessageContent(:final body) => body,
+            _ => "",
+          };
     }
 
     void send() {