message: fix the possible bug for key mapping in Linux GTK library
diff: @@ -1632,7 +1632,7 @@ static gboolean icvOnKeyPress(GtkWidget* widget, GdkEventKey* event, gpointer us
  break;
  case GDK_Return:
  case GDK_Linefeed:
  - code = '\n';
  + code = 13;
  break;
  case GDK_Tab:
  code = '\t';
  