bug#36101: 26.1; epg--status-*SIG does not always precent decode

[Christophe TROESTLER]

Hi,

I received a message with a S/MIME signature that verified correctly (using 
gpgsm).  However, the button has undecoded percent escapes.  It turns out that 
the culprit is the function `epg--status-*SIG' which, when 
(epg-context-protocol context) is 'CMS and `epg-dn-from-string' triggers an 
error, does not perform the decoding of percent escapes.

If, in the body of `epg-dn-from-string', one changes

        (condition-case nil
            (if (eq (epg-context-protocol context) 'CMS)
                (setq user-id (epg-dn-from-string user-id))
              (setq user-id (epg--decode-percent-escape user-id)))
          (error))

into

        (condition-case nil
            (if (eq (epg-context-protocol context) 'CMS)
                (setq user-id (epg-dn-from-string user-id)))
          (error))
        (setq user-id (epg--decode-percent-escape user-id))

it works (provided http://debbugs.gnu.org/cgi/bugreport.cgi?bug=36098 has been 
fixed first).  I do not think `epg--decode-percent-escape' can trigger `error' 
but it is protected everywhere it is used so maybe one should write

        (ignore-errors
          (setq user-id (epg--decode-percent-escape user-id)))

Best,
C.



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