bug#12439: 24.2.50; mail-abbrev fills long aliasee uglily

[Katsumi Yamaoka <yamaoka@jpl.org>]

Katsumi Yamaoka <yamaoka@jpl.org> wrote:
> By default message.el uses mail-abbrev to expand mail aliases in
> headers in a draft.  If an aliasee is longer than fill-column,
> it will be expanded like the following:

> To: foo1@bar.baz, foo2@bar.baz, foo3@bar.baz, foo4@bar.baz,
>     foo5@bar.baz,
>     foo6@bar.baz,
>     foo7@bar.baz,
>     foo8@bar.baz

> To reproduce this, try the "foo" alias specified as follows:

> (define-mail-abbrev "foo"
>   "foo1@bar.baz, foo2@bar.baz, foo3@bar.baz, foo4@bar.baz,\
>  foo5@bar.baz, foo6@bar.baz, foo7@bar.baz, foo8@bar.baz")

> The point is that the latter half addresses in an aliasee are
> put line by line.  Moreover, I think a SPC is enough for LWSP
> preceding to the latter half (message.el uses TAB in some fill
> function, though), rather than the one indent-relative generates.

> A patch I tried is attached below.

I've installed my patch to the trunk.