Fix #270856: IPython hangs with PyGTK

IPython/Shell.py

@@ -776,6 +776,17 b' class IPShellGTK(IPThread):'
                  debug=1,shell_class=MTInteractiveShell):
 
         import gtk
+        # Check for set_interactive, coming up in new pygtk.
+        # Disable it so that this code works, but notify 
+        # the user that he has a better option as well.
+        # XXX TODO better support when set_interactive is released
+        try:
+            gtk.set_interactive(False)
+            print "Your PyGtk has set_interactive(), so you can use the"
+            print "more stable single-threaded Gtk mode."
+            print "See https://bugs.launchpad.net/ipython/+bug/270856"
+        except AttributeError:
+            pass
         
         self.gtk = gtk
         self.gtk_mainloop = hijack_gtk()