Getting currently-selected Gtk::Notebook page

[Ken Restivo <ken restivo org>]

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I'm trying to get the CURRENTLY-selected Gtk::Notebook page. This is driving me bananas, because all that I 
can get is the PREVIOUSLY-selected Gtk::Notebook page, which is utterly useless to me.

The gtk+ C-language callbacks for the "switch-page" signal give me:

"switch-page"                                                     
            void        user_function      (GtkNotebook *notebook, 
                                            GtkNotebookPage *page,
                                            gint page_num,         
                                            gpointer user_data);

I tested this in C, and the page_num variable does in fact deliver the correct number.

But in Perl all I can shift out of there is the notebook widget itself.

Calls to $w->get_current_page(), and $w->page just give me the PREVIOUSLY-selected page.

Even more bizarre: if I get the widget directly using GTK::GladeXML's get_widget() function, and perform 
these same get_current_page() operations on it, I still get the PREVIOUSLY-selected page, NOT the one that is 
sitting there on screen, looking right at me.

How can I fix this? My project is quite stuck without this working.

- -ken
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