diamond fails to open with gtk 3.14

[Stephan Kramer]

On a system with gtk 3.14 (Debian Jessie) diamond fails to open, with:

skramer@gyre:~$ diamond -s git/fluidity/schemas/fluidity_options.rng
Attempt to unlock mutex that was not locked
Aborted

I think this is the same bug as discussed on https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=758619
Long story short: apparently this is a pygtk bug which is unlikely to get fixed since (rather worryingly!) pygtk has been deprecated. There is however a workaround:

=== modified file 'diamond/bin/diamond'
--- diamond/bin/diamond 2012-10-12 20:57:58 +0000
+++ diamond/bin/diamond 2014-10-14 11:11:08 +0000
@@ -24,7 +24,7 @@

 import gtk
 import gtk.gdk
-gtk.gdk.threads_init()
+gtk.set_interactive(0)
 import gobject
 gobject.threads_init()

which seems to work for me.