D9300: Store screenMapping info only once

[Andras Mantia]

amantia added a comment.


  In https://phabricator.kde.org/D9300#179031, @broulik wrote:
  
  > Screen mapper is a singleton type, so it won't cause problems when one screen adds a mapping, it will propagate to the other containments automagically? Before we had `plasmoid.configuration` which signals changes but C++ does not, obviously.
  
  
  I'm not sure if that is a question for me or not. :) Due to being a singleton, I don't see a problem, all instances of the folderview see the same mapping.

REPOSITORY
  R119 Plasma Desktop

BRANCH
  master

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

To: amantia, #plasma, mwolff, hein, broulik, mlaurent, mart
Cc: mart, mlaurent, plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol
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