D24425: Listen to the application style changing

[Kai Uwe Broulik]

broulik created this revision.
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REVISION SUMMARY
  Ensures all controls resize and repaint when the widget style changes.
  There's no style change signal and `QEvent::StyleChange` is only sent to `allWidgets`, so we listen for the `QStyle` instance being destroyed.

TEST PLAN
  - Changed widget style in KCM, the qml controls resized (different padding in styles) and repainted (new look) properly now

REPOSITORY
  R858 Qt Quick Controls 2: Desktop Style

REVISION DETAIL
  https://phabricator.kde.org/D24425

AFFECTED FILES
  plugin/kquickstyleitem.cpp
  plugin/kquickstyleitem_p.h

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