D7912: track the config to monitor, save scale

[Sebastian Kügler]

sebas created this revision.
sebas added a reviewer: davidedmundson.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  When doApplyConfig is called, we forgot to change the monitored config,
  which means we weren't tracking changes anymore. This patch makes sure
  that the new config becomes the monitored one in that case.
  
  Also, save the scale property to the json config, we forgot to do that.
  
  CCBUG:384733

TEST PLAN
  Scale changes through kwin are now saved, they weren't before

REPOSITORY
  R104 KScreen

BRANCH
  scalechange2

REVISION DETAIL
  https://phabricator.kde.org/D7912

AFFECTED FILES
  kded/daemon.cpp
  kded/serializer.cpp

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