[sigc] gtkmm crash test case

[Murray Cumming <murrayc murrayc com>]

Here is a fairly simple test case for a libsigc++ crash, using gtkmm. It
seems to be related to the disconnection of a signal connection in the
signal's handler.

I'm mentioning it here in case anybody has any ideas:
http://bugzilla.gnome.org/show_bug.cgi?id=145571

-- 
Murray Cumming
murrayc murrayc com
www.murrayc.com
www.openismus.com