Make ImapDB.Account.get_search_matches_async greedy stripping consistent

Only strips greey matches if implied by the search query, to make its
results consistent with ::search_async.
7 jobs for wip/search-cleanup in 25 minutes and 59 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #208585
fedora

00:03:46

passed #204770
ubuntu

00:13:56

failed #204769
fedora

00:41:36

 
  Test
passed #204771
deb-package

00:03:50

passed #204772
flatpak

00:07:18

 
  Deploy
passed #204773
review

00:00:27

passed #204774
allowed to fail manual
stop_review

00:00:30