D26621: [kstyle] Drop Qt 4 style plugin

[Vlad Zahorodnii]

zzag created this revision.
zzag added a reviewer: Plasma.
Herald added a project: Plasma.
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REVISION SUMMARY
  KWindowSystem cannot be used in the Qt 4 style plugin. On the other hand,
  we need to use KWindowSystem to make QWidget-based internal clients in
  KWin cast drop-shadows.
  
  Another problem with the Qt 4 style plugin is that some distributions
  have already dropped Qt 4 (it's been EOL for almost 5 years), so one has
  to build it yourself in order to verify that his or her change works
  with Qt 4.
  
  Given maintenance burden and the fact that Qt 6 is around the corner,
  this change drops the Qt 4 style plugin.

REPOSITORY
  R113 Oxygen Theme

BRANCH
  port-to-shadows-api

REVISION DETAIL
  https://phabricator.kde.org/D26621

AFFECTED FILES
  CMakeLists.txt
  kstyle/CMakeLists.txt
  kstyle/config/CMakeLists.txt
  kstyle/config/oxygenstyleconfig.cpp
  kstyle/demo/CMakeLists.txt
  kstyle/demo/main.cpp
  kstyle/demo/oxygendemodialog.cpp
  kstyle/demo/oxygenframedemowidget.cpp
  kstyle/kstylekde4compat.cpp
  kstyle/kstylekde4compat.h
  kstyle/oxygen.h
  kstyle/oxygenmnemonics.cpp
  kstyle/oxygenshadowhelper.cpp
  kstyle/oxygenstyle.cpp
  kstyle/oxygenstyle.h
  kstyle/oxygenstylehelper.cpp
  kstyle/oxygenstylehelper.h
  kstyle/oxygenstyleplugin.cpp
  kstyle/oxygenstyleplugin.h
  kstyle/oxygenwindowmanager.cpp
  kstyle/oxygenwindowmanager.h
  kstyle/transitions/oxygentransitionwidget.cpp
  liboxygen/CMakeLists.txt
  liboxygen/config-liboxygen.h.cmake
  liboxygen/liboxygen.h
  liboxygen/oxygenhelper.cpp
  liboxygen/oxygenhelper.h
  liboxygen/oxygenshadowcache.cpp
  liboxygen/oxygenshadowconfigwidget.cpp
  liboxygen/oxygentileset.cpp

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