[balsa: 2/2] Merge branch 'lock-dest-when-copying' into 'master'

[Albrecht Dreß <albrecht src gnome org>]

commit 8890d2c297a31014863c8d096efac0f187b5f918
Merge: 26e554acc 527ac24c4
Author: Albrecht Dreß <albrecht dress netcologne de>
Date:   Tue Mar 23 19:45:18 2021 +0000

    Merge branch 'lock-dest-when-copying' into 'master'
    
    mailbox: Lock destination when copying or moving
    
    See merge request GNOME/balsa!40

 ChangeLog          | 11 +++++++++++
 libbalsa/mailbox.c | 30 +++++++++++++++++++++---------
 2 files changed, 32 insertions(+), 9 deletions(-)
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