D24255: [startplasma] don't set QT_AUTO_SCREEN_SCALE_FACTOR with Qt >= 5.14

[David Faure]

dfaure created this revision.
dfaure added a reviewer: apol.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
dfaure requested review of this revision.

REVISION SUMMARY
  It gives the following runtime warning:
  
    Warning: QT_AUTO_SCREEN_SCALE_FACTOR is deprecated. Instead use:
       QT_ENABLE_HIGHDPI_SCALING to enable platform plugin controlled per-screen factors
  
  But we don't need to set QT_ENABLE_HIGHDPI_SCALING to 0.
  Just setting QT_SCREEN_SCALE_FACTORS is enough to control scaling, after
  my commit e018d11600bffc6 to qtbase.
  
  Kudos for porting startkde to be C++ code, it makes this commit much
  easier...

TEST PLAN
  Builds; not rebooted yet

REPOSITORY
  R120 Plasma Workspace

BRANCH
  Plasma/5.17

REVISION DETAIL
  https://phabricator.kde.org/D24255

AFFECTED FILES
  startkde/startplasma.cpp

To: dfaure, apol
Cc: plasma-devel, LeGast00n, The-Feren-OS-Dev, jraleigh, fbampaloukas, GB_2, ragreen, ZrenBot, alexeymin, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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