D7921: Reuse the same data when inReplyTo and References are equal

[Volker Krause]

vkrause accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R44 KDE PIM Runtime

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D7921

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