[geary: 2/2] Merge branch 'improve-plaintext-conversion' into 'master'

[Michael Gratton <mjog src gnome org>]

commit 18d847826adfff683fa9e227ecee728315c843b3
Merge: 6ce84ae8 a9efe8fd
Author: Michael Gratton <mike vee net>
Date:   Wed Jan 9 00:50:01 2019 +0000

    Merge branch 'improve-plaintext-conversion' into 'master'
    
    Add plaintext quote marker to blockquote lines in one pass
    
    See merge request GNOME/geary!73

 test/js/composer-page-state-test.vala | 55 ----------------------
 ui/composer-web-view.js               | 89 ++++++++---------------------------
 2 files changed, 19 insertions(+), 125 deletions(-)
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