Correct non-standard binding of report-emacs-bug-insert-to-mailer.

* lisp/mail/emacsbug.el (report-emacs-bug): Change binding of
report-emacs-bug-insert-to-mailer to C-c M-i.

Fixes: debbugs:13510

etc/NEWS

@@ -164,6 +164,11 @@ The PCL-CVS commands are still available via the keyboard.
 ** Using "unibyte: t" in Lisp source files is obsolete.
 Use "coding: raw-text" instead.
 
+** In the buffer made by `M-x report-emacs-bug', the `C-c m' binding
+has been changed to `C-c M-i' (`report-emacs-bug-insert-to-mailer').
+The previous binding, introduced in Emacs 24.1, was a mistake, because
+`C-c LETTER' bindings are reserved for user customizations.
+
 ** Internationalization
 
 *** New language environment: Persian.
@@ -984,9 +989,10 @@ to use the old defaults relying on external mail facilities
 (`sendmail-send-it' on GNU/Linux and other Unix-like systems, and
 `mailclient-send-it' on Windows).
 
-*** Typing C-c m in the buffer made by M-x report-emacs-bug transfers
-the report to your desktop's preferred mail client, if there is one.
-This uses either the "xdg-email" utility, or Mac OS's "open" command.
+*** Typing `C-c m' in the buffer made by `M-x report-emacs-bug'
+transfers the report to your desktop's preferred mail client, if there
+is one.  This uses either the "xdg-email" utility, or Mac OS's "open"
+command.
 
 *** See Changes in Specialized Modes and Packages for SMTPmail changes
 and Mail mode changes

lisp/ChangeLog

+2013-02-09  Chong Yidong  <cyd@gnu.org>
+
+	* mail/emacsbug.el (report-emacs-bug): Change binding of
+	report-emacs-bug-insert-to-mailer to C-c M-i (Bug#13510).
+
 2013-02-02  Alan Mackenzie  <acm@muc.de>
 
 	Fix bug in the state cache mechanism.  Remove 'BOD "strategy".  Refactor.

lisp/mail/emacsbug.el

@@ -332,7 +332,7 @@ usually do not have translators for other languages.\n\n")))
     (use-local-map (nconc (make-sparse-keymap) (current-local-map)))
     (define-key (current-local-map) "\C-c\C-i" 'info-emacs-bug)
     (if can-insert-mail
-	(define-key (current-local-map) "\C-cm"
+	(define-key (current-local-map) "\C-c\M-i"
 	  'report-emacs-bug-insert-to-mailer))
     (setq report-emacs-bug-send-command (get mail-user-agent 'sendfunc)
 	  report-emacs-bug-send-hook (get mail-user-agent 'hookvar))