fix: Used text.rich instead of richtext to fix test

lib/src/channel_preview.dart

@@ -230,10 +230,8 @@ class ChannelPreview extends StatelessWidget {
           text = parts.join(' ');
         }
 
-        return RichText(
+        return Text.rich(
-          maxLines: 1,
+          _getDisplayText(
-          overflow: TextOverflow.ellipsis,
-          text: _getDisplayText(
             text,
             lastMessage.mentionedUsers,
             lastMessage.attachments,
@@ -255,6 +253,8 @@ class ChannelPreview extends StatelessWidget {
                     : FontStyle.normal,
                 fontWeight: FontWeight.bold),
           ),
+          maxLines: 1,
+          overflow: TextOverflow.ellipsis,
         );
       },
     );

lib/src/message_search_item.dart

@@ -123,10 +123,8 @@ class MessageSearchItem extends StatelessWidget {
       text = parts.join(' ');
     }
 
-    return RichText(
+    return Text.rich(
-      maxLines: 1,
+      _getDisplayText(
-      overflow: TextOverflow.ellipsis,
-      text: _getDisplayText(
         text,
         message.mentionedUsers,
         message.attachments,
@@ -142,17 +140,8 @@ class MessageSearchItem extends StatelessWidget {
           fontWeight: FontWeight.bold,
         ),
       ),
-    );
-
-    return Text(
-      text,
       maxLines: 1,
       overflow: TextOverflow.ellipsis,
-      style: StreamChatTheme.of(context).channelPreviewTheme.subtitle.copyWith(
-            fontStyle: (message.isSystem || message.isDeleted)
-                ? FontStyle.italic
-                : FontStyle.normal,
-          ),
     );
   }