msglist [nfc]: Rename to MessageWithPossibleSender for generality

Soon these will only sometimes show the sender.

Author: gnprice

lib/widgets/message_list.dart

@@ -390,7 +390,7 @@ class MessageItem extends StatelessWidget {
       child: Column(children: [
         DecoratedBox(
           decoration: borderDecoration,
-          child: MessageWithSender(item: item)),
+          child: MessageWithPossibleSender(item: item)),
         if (trailing != null && item.isLastInBlock) trailing!,
       ]));
 
@@ -561,9 +561,9 @@ class RecipientHeaderChevronContainer extends StatelessWidget {
   }
 }
 
-/// A Zulip message, showing the sender's name and avatar.
-class MessageWithSender extends StatelessWidget {
-  const MessageWithSender({super.key, required this.item});
+/// A Zulip message, showing the sender's name and avatar if specified.
+class MessageWithPossibleSender extends StatelessWidget {
+  const MessageWithPossibleSender({super.key, required this.item});
 
   final MessageListMessageItem item;
 

test/widgets/message_list_test.dart

@@ -254,7 +254,7 @@ void main() {
     });
   });
 
-  group('MessageWithSender', () {
+  group('MessageWithPossibleSender', () {
     testWidgets('Updates avatar on RealmUserUpdateEvent', (tester) async {
       addTearDown(testBinding.reset);
 
@@ -263,7 +263,7 @@ void main() {
       RealmContentNetworkImage? findAvatarImageWidget(WidgetTester tester) {
         return tester.widgetList<RealmContentNetworkImage>(
           find.descendant(
-            of: find.byType(MessageWithSender),
+            of: find.byType(MessageWithPossibleSender),
             matching: find.byType(RealmContentNetworkImage))).firstOrNull;
       }