[geary: 2/2] Merge branch 'mjog/758-missing-message-id' into 'mainline'

[Michael Gratton <mjog src gnome org>]

commit 8dfa2624812606be85c80c7b49b37a19c8f89a24
Merge: 0edaf3b9 fe760ff4
Author: Michael Gratton <mike vee net>
Date:   Wed Mar 25 03:26:41 2020 +0000

    Merge branch 'mjog/758-missing-message-id' into 'mainline'
    
    Geary.RFC822.Message: Fix Message-Id header not being set
    
    Closes #758
    
    See merge request GNOME/geary!456

 src/engine/rfc822/rfc822-message.vala | 20 +++++++++------
 test/engine/rfc822-message-test.vala  | 48 +++++++++++++++++++++++++++++++++++
 2 files changed, 60 insertions(+), 8 deletions(-)
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