In gtk+4, GdkPixbuf has been replaced by cairo_surface_t in many functions.
A cairo_surface_t pointer is wrapped in a Cairo::RefPtr<Cairo::Surface>.
There are two alternatives for wrapping a returned cairo_surface_t
pointer when it's a nullptr.
1. Cairo::make_refptr_for_instance<Cairo::Surface>(nullptr)
2. Cairo::make_refptr_for_instance<Cairo::Surface>(new
Cairo::Surface(nullptr, has_reference))
Alternative 2 is used in gtkmm methods that have previously returned a
Cairo::RefPtr<Cairo::Surface>. Alternative 1 is more like how subclasses
of GObject are wrapped. The wrap() functions in glibmm and gtkmm return
a nullptr if they are given a nullptr to wrap. I would recommend
alternative 1 also for cairomm objects. Other opinions? I suppose that
there has been a reason for choosing alternative 2.
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