[geary: 7/7] Merge branch 'mjog/folder-load-sync-race' into 'mainline'

[Michael Gratton <mjog src gnome org>]

commit 67d68d083d4e86b8b3bf269deea4c5c5d02d0c2b
Merge: 34921a89d 7f110bfa5
Author: Michael Gratton <mike vee net>
Date:   Tue Feb 23 21:28:20 2021 +0000

    Merge branch 'mjog/folder-load-sync-race' into 'mainline'
    
    Folder load/sync race
    
    See merge request GNOME/geary!663

 src/client/application/application-controller.vala |   8 +-
 src/engine/api/geary-account.vala                  |  13 +-
 .../imap-engine/imap-engine-account-processor.vala |  10 +
 .../imap-engine-account-synchronizer.vala          | 309 +++++++++++++--------
 .../imap-engine/imap-engine-generic-account.vala   |  99 ++++---
 5 files changed, 281 insertions(+), 158 deletions(-)
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