// the viewer update should be blocked in order to avoid the features blinking. For the created
// feature a results are created, the flush of the created signal caused the viewer redisplay for
// each created result. After a redisplay signal is flushed. So, the viewer update is blocked
// the viewer update should be blocked in order to avoid the features blinking. For the created
// feature a results are created, the flush of the created signal caused the viewer redisplay for
// each created result. After a redisplay signal is flushed. So, the viewer update is blocked