D21646: re-read color palettes when application color changes

[Sebastian Kügler]

sebas created this revision.
sebas added a reviewer: Plasma.
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REVISION SUMMARY
  Without this patch, changing the application color scheme from system
  settings only affects some widgets. Notably, checkboxes highlighting
  colors stays the old color, leading to a hodge-podge color scheme and
  bad contrast on some items.
  
  The breeze QStyle caches the colors read via KSharedConfig, so it needs
  to re-read the configuration when the application color changes.
  QApplication emits an event (originating in KGlobalSettings), which we
  can react to.
  
  This fixes the coloring of various widgets in breeze right after color
  changes.
  
  BUG:408416
  FIXED-IN: 5.15.6

TEST PLAN
  1. open kcmshell5 colors
  2. change to a theme with a different highlight color
  3. apply
  4. without patch: checkbox in color KCM (and a whole lot of other widgets all over the place) don't change colors
  5. with patch: colors change as expected

REPOSITORY
  R31 Breeze

BRANCH
  colorchangeeventfilter

REVISION DETAIL
  https://phabricator.kde.org/D21646

AFFECTED FILES
  kstyle/breezestyle.cpp
  kstyle/breezestyle.h

To: sebas, #plasma
Cc: plasma-devel, LeGast00n, ericadams, jraleigh, GB_2, ragreen, Pitel, ZrenBot, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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