D8819: Only notify if the property changes

[David Edmundson]

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

REPOSITORY
  R120 Plasma Workspace

BRANCH
  signals

REVISION DETAIL
  https://phabricator.kde.org/D8819

To: apol, #plasma, davidedmundson
Cc: davidedmundson, plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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