D7482: Automatic scaling selection

[David Edmundson]

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

REVISION SUMMARY
  The generator code is run by the KDED when we don't have a profile for a
  monitor setup.
  
  If we don't have a config this sets the screen scaling to 2 when it has
  an DPI > 1.5*normal DPI. The vertical resolution is also checked that it
  matches what you'd find on a high resolution screen to hopefully avoid
  issues with bogus EDID.
  
  We may need to tweak this heuristic based on feedback, especially when
  want to support fractional scaling.

TEST PLAN
  Removed configs.
  Rebooted
  Laptop screen looked like it should.
  Normal screen was 1x

REPOSITORY
  R104 KScreen

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D7482

AFFECTED FILES
  kded/generator.cpp
  kded/generator.h

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