D7200: Determine if we should use Qt scaling based on env var

[David Edmundson]

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

REVISION SUMMARY
  KWindowSystem::platform() cannot be used before QApplication is
  constructed.
  
  QCoreApplication::setAttribute needs to be called before QApplication is
  constructed.
  
  We need a different method. I've used an explicit new env variable so
  that some users can also opt in to use this when on X.

TEST PLAN
  Logged in. 
  Plasma panels all work. Look to be native resolution.

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D7200

AFFECTED FILES
  shell/main.cpp
  startkde/startplasma.cmake

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