Is inclusion in GIR files transitive?

[Phil Clayton <phil clayton veonix com>]

When a GIR file contains an include entry as follows:

  <include name="<name>" version="<version>"/>

does that implicitly include all namespaces that have an include entry 
in <name>-<version>.gir?

I had been assuming not, i.e. inclusion in GIR files is not transitive. 
 With newer versions of libraries, my GIR processor is complaining 
about references to namespaces that haven't been included.  I see that 
e.g. Gtk-3.0.gir contains:

  <include name="Atk" version="1.0"/>
  <include name="Gdk" version="3.0"/>
  <include name="xlib" version="2.0"/>

whereas, for older library versions, it used to contain:

  <include name="Atk" version="1.0"/>
  <include name="GLib" version="2.0"/>
  <include name="GModule" version="2.0"/>
  <include name="GObject" version="2.0"/>
  <include name="Gdk" version="3.0"/>
  <include name="GdkPixbuf" version="2.0"/>
  <include name="Gio" version="2.0"/>
  <include name="Pango" version="1.0"/>
  <include name="cairo" version="1.0"/>
  <include name="xlib" version="2.0"/>

Lots of libraries seem to be like this so I am now assuming that 
inclusion in GIR files _is_ transitive.  There isn't a lot to go on in
https://developer.gnome.org/gi/unstable/gi-gir-reference.html

I am now wondering whether that is the right assumption because I am 
finding that g_irepository_get_dependencies is not returning all 
transitive dependencies (see attached).  It's supposed to because the 
documentation says so:
https://developer.gnome.org/gi/unstable/GIRepository.html#g-irepository-get-dependencies
Is that just a bug in GIRepository due to a change in the meaning of GIR 
files?

Thanks,
Phil

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