bug#46463: 27.1; rmailout glitch

[Francesco Potortì]

Using the latest versions from trunk as of 11 February:

rmailsum
rmailout
rmailmm
rmail
rmailedit

- run rmail on a mail file with N messages (N>1)
- delete message N
- go to message N-1 and press 'o' to output it to a different mail
  file: a message says that no undeleted messages exist and you still
  see message N-1 (which is correct)
- (setq rmail-output-reset-deleted-flag t
        rmail-delete-after-output t)
- undelete message N-1
- press 'o': no message is displayed and you see (deleted) message N

If only rmail-delete-after-output is set, I can't see the problem