Re: address@hidden: Emacs very slow opening file]

[Richard M. Stallman]

    When Emacs is running diff itself, it could start the output off with
    an appropriate -*- type string overriding a possible local variables
    block.  Or it could append a solitary ^L to the output (which is the
    normal way of telling Emacs not to look further backward for a local
    variables section).

That would work.  However, if the other idea can work--recognize that
the Local Variables list is inside a diff hunk--that would work more
generally.