[dovecot/core] ce59b1: imapc: Use UID SEARCH instead of SEARCH

[GitHub]

  Branch: refs/heads/master-2.2
  Home:   https://github.com/dovecot/core
  Commit: ce59b1bdd19f5c266ed6321b0ceca07f5600d345
      https://github.com/dovecot/core/commit/ce59b1bdd19f5c266ed6321b0ceca07f5600d345
  Author: Timo Sirainen <timo.sirainen at dovecot.fi>
  Date:   2017-04-26 (Wed, 26 Apr 2017)

  Changed paths:
    M src/lib-storage/index/imapc/imapc-search.c

  Log Message:
  -----------
  imapc: Use UID SEARCH instead of SEARCH

UIDs work better for some broken IMAP servers, so it's safer to use it.

Keep using sequences for ESEARCH, since servers supporting it aren't at
least yet known to be broken and the search result with sequences is
smaller.