[geary: 9/9] iMerge branch 'wip/90-304-image-dnd-paste' into 'mainline'

[Michael Gratton <mjog src gnome org>]

commit 8f2563bc095f2c8886ff29e49656a20c7cf1bdc4
Merge: db289898 c3f5cc1b
Author: Michael James Gratton <mike vee net>
Date:   Sun Nov 17 16:42:12 2019 +1100

    iMerge branch 'wip/90-304-image-dnd-paste' into 'mainline'
    
    Inline image drag and drop #90 and image paste from clipboard #304
    
    See merge request GNOME/geary!343

 src/client/composer/composer-web-view.vala        |  42 ++++++-
 src/client/composer/composer-widget.vala          | 129 +++++++++++++++++++---
 src/client/web-process/web-process-extension.vala |   3 +-
 src/engine/api/geary-composed-email.vala          |  27 +++--
 src/engine/rfc822/rfc822-message.vala             |  65 +++++++++--
 test/data/org.gnome.GearyTest.gresource.xml       |   1 +
 test/data/test-attachment-image.png               | Bin 0 -> 7153 bytes
 test/engine/api/geary-composed-email-test.vala    |  53 +++++++++
 test/engine/rfc822-message-test.vala              | 121 ++++++++++++++++++++
 test/meson.build                                  |   1 +
 test/test-engine.vala                             |   1 +
 ui/composer-web-view.js                           |  31 ++++++
 12 files changed, 433 insertions(+), 41 deletions(-)
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