Re: Bugs caused by recent use of define-derived-mode

[Richard Stallman]

    Suggestion: by default, the commands use the "most local" abbrev
    table.

That is a natural way to address such an issue, but I have a feeling
it is not right here.  The reason is, I think most of the time people
will want the same abbrevs in all the related modes.  There may be a
few people who wanted abbrevs just for Mail mode, but most people are
happy with sharing one abbrev table between Mail mode and Text mode.