[geary] (11 commits) ...Merge branch 'wip/draft-management' into 'mainline'

[Michael Gratton <mjog src gnome org>]

Summary of changes:

  4e513e3... Allow saving drafts when closing composer due to view chang (*)
  c6d4887... Restore and show reply-to and bcc headers if present in dra (*)
  51ac4b7... Don't reopen drafts that are already open in a composer (*)
  daa01c3... Rework how managing composers works when switching conversa (*)
  fdb3542... Clean up async parts of loading the composer (*)
  b4f4cbb... Infer draft status from composer's draft_id property (*)
  e037342... Fix double-clicking on a draft in the conversation list (*)
  0ab18a3... Don't clobber in-window composers on conversation count cha (*)
  f68970a... Fix composers that open detached having a visible detach bu (*)
  5256fd9... Hide composer save button if an error occurs opening draft  (*)
  a3cf389... Merge branch 'wip/draft-management' into 'mainline'

(*) This commit already existed in another branch; no separate mail sent