Re: last-sexp-toggle-display

[Richard Stallman]

    If this feature can not be made to work satisfactorily with editing
    the text, then I believe that the keymap should kill itself (and any
    special coloring or fontification that would be associated with it)
    upon editing of the text.

That might be a reasonable idea, but I don't think I want to try to
implement it now.

                               (That would automatically get rid of the
    above bug.)  The feature is mainly useful immediately after the
    original command anyway.

I don't agree about that.  The feature is usefu later too.