gboolean gtk_text_view_get_iter_at_location ( GtkTextView* text_view, GtkTextIter* iter, gint x, gint y )
Retrieves the iterator at buffer coordinates
coordinates are coordinates for the entire buffer, not just the
currently-displayed portion. If you have coordinates from an
event, you have to convert those to buffer coordinates with gtk_text_view_window_to_buffer_coords().
The argument will be set by the function. The data is owned by the instance.
X position, in buffer coordinates.
Y position, in buffer coordinates.