[pygtk] gtk_tree_view_drag_begin assertion

[Vic Watson]

Hi All.

I'm trying to fix a drag/drop fault on a PyGTK application.

On the very first drag, I get the following warning on the console:

GtkWarning: gtk_tree_view_drag_begin: assertion `path != NULL' failed

This seems to be benign - AFAICT, the drag works - but it's frightening the horse, and I'd like to fix it.

Can anyone point me at some details of what this path is and how I go about making sure it isn't null?

Thanks!

Vic.

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