:diffsplit | verbose set fdm?

[Benji Fisher]

     While replying to a post on the vim users' list, I noticed a slight
problem.  The diff commands set some options, but this is not reported
with "verbose set".  For example

:e foo.txt
:set fdm=marker
:diffsplit bar.txt
:wincmd w       " back to foo.txt
:verbose set fdm?
  foldmethod=diff
:only
:verbose set fdm?
  foldmethod=manual

                                        --Benji Fisher