fix(terminal): reconnect suppress next output

Signed-off-by: fufesou <linlong1266@gmail.com>

flutter/lib/models/terminal_model.dart

@@ -288,8 +288,7 @@ class TerminalModel with ChangeNotifier {
       // On reconnect, the server may replay recent output. That replay can include
       // terminal queries like DSR/DA; xterm answers them through onOutput as
       // "^[[1;1R^[[2;2R^[[>0;0;0c", which must not be sent back to the peer.
-      _suppressNextTerminalDataOutput =
-          message == 'Reconnected to existing terminal with pending output';
+      _suppressNextTerminalDataOutput = evt['replay_in_next_data'] == true;
 
       // Fallback: if terminal view is not yet ready but already has valid
       // dimensions (e.g. layout completed before open response arrived),