D8195: Improve render plugin selection

[Volker Krause]

vkrause created this revision.
vkrause added a reviewer: knauss.
Restricted Application added a project: KDE PIM.
Restricted Application added a subscriber: KDE PIM.

REVISION SUMMARY
  This now considers two additional attributes:
  
  - the message mimetype, with the most specific matching one considered first
  - a plugin priority to disambiguate as a last resort
  
  This became necessary with the fairly aggressive syntax highlighting
  plugin also triggering on vcard or ical attachments. Their plugins now
  have priority, as their mimetypes are more specific than text/plain the
  highlighting plugin is registered for.

REPOSITORY
  R94 PIM: Message Library

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D8195

AFFECTED FILES
  messageviewer/src/messagepartthemes/default/defaultrenderer.cpp
  messageviewer/src/messagepartthemes/default/defaultrenderer_p.h
  messageviewer/src/messagepartthemes/default/messagepartrendererbase.h
  messageviewer/src/messagepartthemes/default/messagepartrendererfactory.cpp
  messageviewer/src/messagepartthemes/default/messagepartrendererfactory.h
  messageviewer/src/messagepartthemes/default/messagepartrendererfactory_p.h
  messageviewer/src/messagepartthemes/default/plugins/attachmentmessagepartrenderer.cpp
  mimetreeparser/src/viewer/messagepart.h

To: vkrause, knauss
Cc: #kde_pim, dvasin, winterz, vkrause, mlaurent, knauss, dvratil
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