[pygtk] connect to the event "selection changed" in textbuffer/textview

[Giuseppe Penone]

Hi,
I would like to connect to any situation when the selection in the
textbuffer/textview changes:

1) from no selection to selection
2) the selection changed bounds
3) from selection to no selection

but I see no way to do it since there's no a signal for this.
If anybody has a clue about how to obtain it please help.
Best regards,
Giuseppe.
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