D5048: store contrast matrix per-window

[Marco Martin]

mart created this revision.
Restricted Application added a project: KWin.
Restricted Application added subscribers: KWin, kwin, plasma-devel.

REVISION SUMMARY
  as different windows can have different contrast region parameters,
  store color matrices per window

TEST PLAN
  logout window doesn't break panel anymore

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D5048

AFFECTED FILES
  effects/backgroundcontrast/contrast.cpp
  effects/backgroundcontrast/contrast.h

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