Add flexible to file messages to prevent long name overflow (#3551)

lib/pages/chat/events/message_download_content.dart

@@ -53,6 +53,10 @@ class MessageDownloadContent extends StatelessWidget {
                     backgroundColor: textColor.withAlpha(32),
                     child: Icon(Icons.file_download_outlined, color: textColor),
                   ),
+                  // #Pangea
+                  Flexible(
+                    child:
+                        // Pangea#
                         Column(
                       crossAxisAlignment: CrossAxisAlignment.start,
                       mainAxisSize: MainAxisSize.min,
@@ -74,6 +78,7 @@ class MessageDownloadContent extends StatelessWidget {
                         ),
                       ],
                     ),
+                  ),
                 ],
               ),
             ),