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bug#35265: 26.1; gnus-icalendar: charset detection

From: Robert Pluim
Subject: bug#35265: 26.1; gnus-icalendar: charset detection
Date: Sun, 14 Apr 2019 14:41:25 +0200

>>>>> On Sun, 14 Apr 2019 09:32:32 +0000, Christophe TROESTLER <address@hidden> 
>>>>> said:

    Christophe> Ical invitations sent by Google use a content type
    Christophe> such as

    Christophe>   Content-Type: text/calendar; charset="UTF-8";
    Christophe> method=REQUEST

    Christophe> The problem is that the charset is not properly
    Christophe> understood by gnus-icalendar because it is
    Christophe> capitalized.  The following “downcase” in the
    Christophe> definition of “gnus-icalendar-with-decoded-handle”
    Christophe> fixes the problem:

Looks obviously correct. Eli, can I put this in emacs-26?

>From 009929e3bb10692bd5ac10e4f1613cc6065a21e7 Mon Sep 17 00:00:00 2001
From: Robert Pluim <address@hidden>
Date: Sun, 14 Apr 2019 14:36:30 +0200
Subject: [PATCH] Downcase charset
To: address@hidden

RFC 2046 specifies that the charset parameter is case-insensitive.

* lisp/gnus/gnus-icalendar.el (gnus-icalendar-with-decoded-handle):
Downcase charset.  Suggested by Christophe TROESTLER
<address@hidden>.  (Bug#35265).
 lisp/gnus/gnus-icalendar.el | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lisp/gnus/gnus-icalendar.el b/lisp/gnus/gnus-icalendar.el
index f79ce36843..e4ad2af063 100644
--- a/lisp/gnus/gnus-icalendar.el
+++ b/lisp/gnus/gnus-icalendar.el
@@ -767,7 +767,7 @@ gnus-icalendar-with-decoded-handle
     `(let ((,charset (cdr (assoc 'charset (mm-handle-type ,handle)))))
          (mm-insert-part ,handle)
-         (when (string= ,charset "utf-8")
+         (when (string= (downcase ,charset) "utf-8")
            (decode-coding-region (point-min) (point-max) 'utf-8))

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