bug#24774: 26.0.50; Menu display navigation commands

[Drew Adams]

> >> So rewriting the emacs-lisp menus using easymenu should be
> >> uncontroversial.
> >
> > Really?  _Why_ rewrite them?
> 
> They would be easier to read, understand and change.

Easier for whom?

I don't find maintenance easier with easy-menu.  I find
it harder.  Of course my "maintenance" of existing Emacs
menus means adding to, or otherwise changing, them.

(How do you do the equivalent of a `define-key-after',
for example?  Oh, or is there no equivalent?)