bug#58843: Print "decrypted" rot13 text is buffer is read-only

[Philip Kaludercic <philipk@posteo.net>]

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Eli Zaretskii <eliz@gnu.org> writes:

>> From: Philip Kaludercic <philipk@posteo.net>
>> Cc: 58843@debbugs.gnu.org
>> Date: Sat, 29 Oct 2022 16:03:39 +0000
>> 
>> Eli Zaretskii <eliz@gnu.org> writes:
>> 
>> > LGTM, but what about the suitable change to the user manual?
>> 
>> I can't appear to find anything in the manual mentioning rot13.  Are you
>> suggesting creating a new node?
>
> No, this is described in the "Rmail Rot13" node.

Ah yes.  How does this look like:


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diff --git a/doc/emacs/rmail.texi b/doc/emacs/rmail.texi
index e38bde036a..4939f5597c 100644
--- a/doc/emacs/rmail.texi
+++ b/doc/emacs/rmail.texi
@@ -1409,6 +1409,13 @@ Rmail Rot13
 rot13-other-window}.  This displays the current buffer in another window
 which applies the code when displaying the text.
 
+@findex rot13-region
+  If you are only interested in a region, the command @kbd{M-x
+rot13-region} might be preferable.  This will decrypt the active
+region in place.  If the buffer is read-only, it will attempt to
+display the plain text in the echo area.  If the text is too long, a
+separate buffer will be used.
+
 @node Movemail
 @section @command{movemail} program
 @cindex @command{movemail} program