D18612: Cache the default KColorScheme configuration

[Milian Wolff]

mwolff created this revision.
mwolff added reviewers: Kate, KDevelop, dfaure.
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REVISION SUMMARY
  KDevelop, Kate and probably other applications too, recreate
  KColorScheme instances repeatedly. This was very costly since we
  ended up reparsing the internal color scheme configuration file
  every time - the shared configuration wasn't stored anywhere thus
  it's refcount dropped to zero after once the KColorScheme was
  fully constructed.
  
  Optimize this apparently common scenario by caching the configuration
  in a thread_local variable and only open a new configuration when the
  user changed the application color scheme.

REPOSITORY
  R265 KConfigWidgets

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D18612

AFFECTED FILES
  src/kcolorscheme.cpp

To: mwolff, #kate, #kdevelop, dfaure
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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