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
<Christophe.TROESTLER@umons.ac.be>. (Bug#35265).
`(let ((,charset (cdr (assoc 'charset (mm-handle-type ,handle)))))
(with-temp-buffer
(mm-insert-part ,handle)
- (when (string= ,charset "utf-8")
+ (when (string= (downcase ,charset) "utf-8")
(decode-coding-region (point-min) (point-max) 'utf-8))
,@body))))