bug#27656: 26.0.50; Fix "Make mail-extract-address-components return the user name more"

[OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>]

In bug#22594 (https://debbugs.gnu.org/cgi/bugreport.cgi?bug=22594,
commit 8b50ae8b2284b5652c2843a9d0d076f4f657be28), it added "(when
mail-extr-ignore-single-names" line to mail-extract-address-components.
But it became the cases of the bug rather.

Original report is, name is not printed the following case.

(mail-extract-address-components "Rasmus <rasmus <at> gmx.us>")
=> (nil "rasmus <at> gmx.us")

But this is, because of "mail-extr-ignore-realname-equals-mailbox-name",
name and mailbox is same, so name is not printed.

Here is more tests of mail-extract-address-components with before and
after reverting that commit.

(dolist (addr '("Rasmus <rasmus@gmx.us>" "Rasmus <mbox@gmx.us>"))
  (dolist (ignore-single '(t nil))
    (dolist (ignore-same '(t nil))
      (let ((mail-extr-ignore-single-names ignore-single)
	    (mail-extr-ignore-realname-equals-mailbox-name ignore-same))
	(message "%s" (mail-extract-address-components addr))))))

[Before reverted]	;; ignore-single, ignore-same: result: comment
(nil rasmus@gmx.us)	;; t, t:     OK: single name is ignored
(nil rasmus@gmx.us)	;; t, nil:   OK: single name is ignored
(Rasmus rasmus@gmx.us)	;; nil, t:   BAD: printed even if same with mailbox
(Rasmus rasmus@gmx.us)	;; nil, nil: OK:
(nil mbox@gmx.us)	;; t, t:     OK: single name is ignored
(nil mbox@gmx.us)	;; t, nil:   OK: single name is ignored
(Rasmus mbox@gmx.us)	;; nil, t:   OK: name is different with mailbox
(Rasmus mbox@gmx.us)	;; nil, nil: OK:

[After reverted]
(nil rasmus@gmx.us)	;; t, t:     OK: single name is ignored
(nil rasmus@gmx.us)	;; t, nil:   OK: single name is ignored
(nil rasmus@gmx.us)	;; nil, t:   OK: name is same with mailbox, ignored 
(Rasmus rasmus@gmx.us)	;; nil, nil: OK:
(nil mbox@gmx.us)	;; t, t:     OK: single name is ignored
(nil mbox@gmx.us)	;; t, nil:   OK: single name is ignored
(Rasmus mbox@gmx.us)	;; nil, t:   OK:
(Rasmus mbox@gmx.us)	;; nil, nil: OK:

At lest, IMO, reverting commit 8b50ae8b2284b5652c2843a9d0d076f4f657be28
seems to be working as expected rather.



In GNU Emacs 26.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.16)
 of 2017-07-12 built on devron
Repository revision: d014a5e15c1110af77e7a96f06ccd0f0cafb099f
Windowing system distributor 'The X.Org Foundation', version 11.0.11903000
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-- 
OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>