With format=flowed, generating a message containing the lines one blank two blanks three blanks (like this message) each of the above lines is displayed with one less space than is indicated by the numbers. The actual message in the mailbox does contain the correct number of spaces.
(In latest repository version, but also occurs with 1.5.13). I am not familiar with the details of the space-stuffing conventions for format=flowed, but since mutt both generated and is displaying the message, it seems that mutt should either be adding an extra space when creating the message (which it would then swallow when displaying it), or should avoid chomping the beginning space when displaying the message. -- Andras Salamon and...@dns.net