> That's orthogonal.  (And it seems to issue the warning in an unrelated
 > case, handled by the 'else' clause?)

Which case?

 > We should first decide how to
 > support the context menus with this stuff, and then we can talk how to
 > find code out there which makes similar assumptions.  (But if there is
 > such code out there, how was it working till now?)

Maybe I have not been making myself clear.  What I would apply is the
attached (modulo any errors it contains): No change in behavior, just a
warning in the doc-string and suspicious calls.

martin