problem to recognize the changing of the cursor in a GtkEditable

[Markus Harz <harz gia rwth-aachen de>]

Hi everybody,

I want to recognize where the cursor moves in my GtkEditable (GtkText)
to
get its position/the current row. The "changed"-signal is useless I
guess,
because it will only be send, when the text is changed, but not when I
move the cursor. 
I tried a few other signal-handlers to my GtkEditable (GtkText), but non
of them works. But perhaps I´m doing something wrong.
Thanks for your help.

Markus Harz