[Bug 1851124] Re: sort = mailbox-order not unsorted

[David Seppi]

Also tested with:

Ubuntu version: 19.10
Mutt version: 1.10.1-2.1

** Tags added: disco

** Tags added: eoan

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https://bugs.launchpad.net/bugs/1851124

Title:
  sort = mailbox-order not unsorted

Status in mutt package in Ubuntu:
  New

Bug description:
  Ubuntu version: 19.04
  Mutt version: 1.10.1-2

  I use mutt to read mails from an IMAP server.

  My .muttrc contains two lines that I assume to be relevant for this
  bug:

  set header_cache = '~/.muttcache'
  set sort = mailbox_order

  Expected behaviour:

  My mailbox should be unsorted (i.e. all messages appear in the same
  order as provided by the IMAP fetch 1:* command).

  Observed behaviour:

  Messages that are already cached (part of the header cache file) are
  sorted in the following way:

  1. all messages without the Deleted flag
  2. all messages with the Deleted flag

  New messages (not part of the cache file) appear at the bottom (after
  the deleted messages), so there's a block of deleted messages between
  the last cached not deleted message and the first new message.

  When I delete the header cache file (or disable header caching)
  everything works as expected (mails are unsorted).

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