bug#34657: 26.1; Some erc hook names lack the expected suffix

[Eli Zaretskii]

> Cc: 34657@debbugs.gnu.org
> From: Phil Sainty <psainty@orcon.net.nz>
> Date: Thu, 28 Feb 2019 00:01:02 +1300
> 
> I've pushed branch fix/bug-34657-erc-hooks for this, and I've used
> define-obsolete-variable-alias, but there are problems with the
> customize behaviour.
> 
> The first annoyance is that in customize-group erc-hooks the alias
> is displayed (albeit slightly differently) as well as the renamed
> option.

Isn't there some precedent for handling this?

If we never did rename a defcustom before, and no simple solution
presents itself, I'd rather drop the idea altogether.  ERC is a niche
package, so it's not a catastrophe if we have exceptions from the rule
here.

Thanks.

(What is the second annoyance?)