[geary: 2/2] Merge branch 'wip/29-ms-breaks-plain-sigs' into 'master'

[Michael Gratton <mjog src gnome org>]

commit f3ad1fe00d80894eb7c1e9bfca7230c5f3ced675
Merge: adf21161 f3e8b262
Author: Michael Gratton <mike vee net>
Date:   Wed Sep 12 11:09:34 2018 +0000

    Merge branch 'wip/29-ms-breaks-plain-sigs' into 'master'
    
    Fix plain text signatures losing their formatting when rendered by MS products
    
    See merge request GNOME/geary!33

 src/client/accounts/add-edit-page.vala   |  2 +-
 src/client/composer/composer-widget.vala |  2 +-
 src/engine/rfc822/rfc822-utils.vala      | 10 ++--
 src/engine/util/util-html.vala           | 84 +++++++++++++++++++++-----------
 test/engine/util-html-test.vala          | 46 ++++++++++++-----
 5 files changed, 99 insertions(+), 45 deletions(-)
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