[Bug 730509] facedetect: fix update on change

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=730509
  GStreamer | gst-plugins-bad | 1.x

--- Comment #4 from Nicola <lists at svrinformatica.it> 2014-07-20 22:02:58 UTC ---
on_change:

- face detected => bus message
- face detected => no bus message
- face detected => no bus message
- no face detected => bus message
- no face detected => no bus message
- no face detected => no bus message
- face detected => bus message

on_face:

- face detected => bus message
- face detected => bus message
- face detected => bus message
- no face detected => no bus message
- no face detected => no bus message
- face detected => bus message

is clear now?

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