Ok, got it working.

It turns out that there are some more GTK3 tests in the same file which
modify the argument list for the item_inserted_cb. It is necessary to
remove all the tests so that only the GTK3 versions are present
regardless of whether we are actually using GTK3 or not. Failure to do
this caused the callback to be called with the wrong args, causing the
segfault.

What I still don't understand:

* Why "insert" was special cased, but "remove" was not.
* How did this code ever work before.
* What changed to make it stop working.

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https://bugs.launchpad.net/bugs/1203888

Title:
  appindicator ignores menu entries after having sent the menu to the
  indicator

Status in Glipper:
  New
Status in “blueman” package in Ubuntu:
  Confirmed
Status in “glipper” package in Ubuntu:
  Triaged
Status in “libappindicator” package in Ubuntu:
  Triaged

Bug description:
  On Saucy, the glipper appindicator shows but none of its menu items
  show up when left or right-clicking on it.

  $ glipper
  SHARED_DATA_DIR: /usr/share/glipper
  Binding shortcut <Ctrl><Alt>c to popup glipper
  Changed process name to: glipper
  /usr/lib/python2.7/dist-packages/glipper/AppIndicator.py:43: Warning: 
/build/buildd/glib2.0-2.37.3/./gobject/gsignal.c:2475: signal 'child-added' is 
invalid for instance '0x20c90f0' of type 'GtkMenu'
    self._app_indicator.set_menu(self.menu)

  (glipper:20249): LIBDBUSMENU-GLIB-WARNING **: About to Show called on
  an item wihtout submenus.  We're ignoring it.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: glipper 2.4-3
  ProcVersionSignature: Ubuntu 3.10.0-4.13-generic 3.10.1
  Uname: Linux 3.10.0-4-generic x86_64
  ApportVersion: 2.11-0ubuntu1
  Architecture: amd64
  Date: Mon Jul 22 18:17:16 2013
  InstallationDate: Installed on 2013-06-14 (38 days ago)
  InstallationMedia: Ubuntu-GNOME 13.10 "Saucy Salamander" - Alpha amd64 
(20130613)
  MarkForUpload: True
  PackageArchitecture: all
  SourcePackage: glipper
  UpgradeStatus: No upgrade log present (probably fresh install)

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