D9768: Cache KColorScheme instances

[Aleix Pol Gonzalez]

apol created this revision.
apol added reviewers: Frameworks, mart.
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REVISION SUMMARY
  This patch catches the few different KColorScheme we use so that every
  widget can access the same instead of computing it separately.
  As is, the different KColorScheme were initialised really often for every
  widget that specifies a colorSet.

TEST PLAN
  Used it with Discover and Kirigami Gallery

REPOSITORY
  R858 Qt Quick Controls 2: Desktop Style

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D9768

AFFECTED FILES
  kirigami-plasmadesktop-integration/plasmadesktoptheme.cpp
  kirigami-plasmadesktop-integration/plasmadesktoptheme.h

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