Re: void Gtk::Widget::get_preferred_width pass nullptr

The docs are autogenerated from the C documentation. Things like this aren't intelligently changed. (It's only more basic stuff like changing NULL to "nullptr").

It would be good if they were, but I don't know if anyone would want to try changing the doc processor to detect phrases like "or NULL" and drop them for reference args.

Yes, you just need to pass a reference to a real, 'dummy' int.

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