[geary: 3/3] Merge branch '937-retain-messages-during-gc' into 'mainline'

[Michael Gratton <mjog src gnome org>]

commit 710eeb1e650607dcd086c804cb13c38feae2d8bd
Merge: 697d60ebb 4fdaaeacd
Author: Michael Gratton <mike vee net>
Date:   Wed Aug 26 22:07:50 2020 +0000

    Merge branch '937-retain-messages-during-gc' into 'mainline'
    
    Retain a number of messages when performing GC
    
    Closes #937
    
    See merge request GNOME/geary!556

 src/engine/imap-db/imap-db-folder.vala       | 44 +++++++++++++++++++++-------
 test/engine/imap-db/imap-db-folder-test.vala | 25 +++++++++++++++-
 2 files changed, 58 insertions(+), 11 deletions(-)
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