D9300: Store screenMapping info only once

[Andras Mantia]

amantia created this revision.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  Until now every FolderView applet stored exactly the same screenMapping info in the config file. Store it only once 
  using the config object of the Plasma::Corona

REPOSITORY
  R119 Plasma Desktop

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D9300

AFFECTED FILES
  containments/desktop/package/contents/config/main.xml
  containments/desktop/package/contents/ui/FolderViewLayer.qml
  containments/desktop/plugins/folder/screenmapper.cpp

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