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

[Richard Stallman]

    abbrev-tables should be able to inherit from each other.

It is hard to make inheritance for abbrev-tables a coherent feature.
The problem is that it isn't obvious what is the right thing to do
when users define new abbrevs.  If a user defines a new abbrev while
in Paragraph-Indent Text mode, should it go in the Text mode abbrev
table or the Paragraph-Indent Text mode abbrev table?  Neither one is
clearly always right.

I think the best solution is not to have a different abbrev table for
Paragraph-Indent Text mode.

This issue does not arise for syntax tables because users rarely alter
them.

Could you please install that mail-mode patch?