Code review comment for lp:~spud/spud/copy-paste-fix

The above was done by first adding a new nonlinear_solver element then running CTRL+C on the old copy nonlinear_solver::Simple then moving to the new element and pressing CTRL+V.

If instead I use the right-click feature I get:

Traceback (most recent call last):
  File "/home/cwilson/spud/bzr-repo/copy-paste-fix/diamond/bin/../diamond/interface.py", line 658, in on_copy
    if widget is not self.treeview and gobject.signal_lookup("copy-clipboard", widget):
TypeError: type must be instantiable or an interface

on copy and:

Traceback (most recent call last):
  File "/home/cwilson/spud/bzr-repo/copy-paste-fix/diamond/bin/../diamond/interface.py", line 681, in on_paste
    if widget is not self.treeview and gobject.signal_lookup("paste-clipboard", widget):
TypeError: type must be instantiable or an interface

on paste.