"Eric Cashon via gtk-perl-list" <gtk-perl-list@gnome.org>:
> A GtkDrawingArea has it's own window to draw on.

You're right, there seems to be a lot of changes going on in this area under 
the hood.  I was basing my statement on the C code in gtk+'s master branch, 
where drawing areas clearly have no GdkWindow of their own:

https://git.gnome.org/browse/gtk+/tree/gtk/gtkdrawingarea.c#n301

But it looks like this is a recent change, because on the gtk-3-22 branch 
drawing areas do have their own GdkWindow:

https://git.gnome.org/browse/gtk+/tree/gtk/gtkdrawingarea.c?h=gtk-3-22#n187
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