bug#13506: 24.3.50; loading emacsbug.el ignores customized `send-mail-function'

[Eli Zaretskii]

> Date: Mon, 10 Feb 2014 09:48:48 -0800 (PST)
> From: Drew Adams <drew.adams@oracle.com>
> Cc: 13506@debbugs.gnu.org
> 
> > > I just discovered that if you have customized `send-mail-function'
> > > to `mailclient-send-it', but you load that customization after
> > > loading `emacsbug.el[c]' (for whatever reason), then your user
> > > setting is simply ignored.
> > 
> > `message-send-mail-function' is the variable to customize here, I
> > think?
> 
> Why?  And why is that relevant, even if true?

Because defcustoms don't get overwritten when you re-load their source
package?