D6126: Support fractional scaling in generating the sidebar preview

[David Edmundson]

davidedmundson created this revision.
Restricted Application added projects: Plasma, Frameworks.
Restricted Application added subscribers: Frameworks, kwrite-devel, plasma-devel.

REVISION SUMMARY
  QPaintDevice::devicePixelRatio was replaced by devicePixelRatioF when Qt
  supported fractional scaling as the type changed but needed to keep API. 
  Every other call to devicePixelRatio was already a qreal.
  
  The sidebar was already scaled up to the fractional size, but the pixmap
  was generated at the integer version. End result is that it wasn't quite as
  crisp as it could be.

TEST PLAN
  QT_SCALE_FACTOR=1.4 kate
  Opened bug fix and used minimap as before
  My extra assert in QPaintDevice::devicePixelRatio was never fired

REPOSITORY
  R39 KTextEditor

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D6126

AFFECTED FILES
  src/view/kateviewhelpers.cpp

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