bug#31271: 25.2; exported deleted RMAIL emails should have theit deleted flag reset

[Francesco Potortì]

>What about the question I asked:
>
>> What about invoking 'o' with a prefix argument -- should it stop
>> ignoring deleted messages when it looks for the N-1 additional
>> messages to output to a file, when this option is set non-nil?

Sorry, I had missed that one.

>The code I posted still ignores deleted messages, except for the
>message that is current when the command is invoked.  Is that
>reasonable?

I'd say it is reasonable, but I am not sure.

Suggestion: when the new option is set to t, RMAIL ignores the deleted
flag (that is, it goes through all messages, deleted or not) and asks
for confirmation for every deleted message it meets.  The archived
message has its deleted flag cleared.

This behaviour is not surprising, it is consistent, it does not break
old macros because you have to set the new option to t.