Ticket #4104: chattr: mouse clicks on checkboxes have no effect.

(chattrboxes_mouse_callback): mouse events other than scroll ones are
unhandled.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>

src/filemanager/chattr.c

@@ -865,6 +865,8 @@ chattrboxes_mouse_callback (Widget * w, mouse_msg_t msg, mouse_event_t * event)
         break;
 
     default:
+        /* return MOU_UNHANDLED */
+        event->result.abort = TRUE;
         break;
     }
 }