D7214: Add virtual Scene::scenePainter method

[Martin Flöser]

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

REVISION SUMMARY
  So far EffectsHandlerImpl directly accessed SceneQPainter::painter
  through a dynamic cast. If in future the QPainter based compositor should
  be moved into a plugin we cannot access it through a dynamic cast.
  
  To solve this problem the painter method is moved into Scene as
  a virtual method returning a sane default value.

BRANCH
  scene-qpainter

REVISION DETAIL
  https://phabricator.kde.org/D7214

AFFECTED FILES
  effects.cpp
  scene.cpp
  scene.h
  scene_qpainter.cpp
  scene_qpainter.h

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