D11960: Support nvidia reset notifications in QtQuickViews

[David Edmundson]

davidedmundson created this revision.
davidedmundson added a reviewer: Plasma.
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REVISION SUMMARY
  In line with changes in Qt, we support 
  GL_PURGED_CONTEXT_RESET_NV. On a graphical error
  we recreate entire QtQuick scene contexts.
  
  It can break custom render loops, so the change
  is opt-in. This flag enables it for all plasma windows.

TEST PLAN
  Suspended PC, resume.
  Icons on desktop are not garbled pernamently.
  Unpatched kwin with Aurorae does not busy-loop forever.

REPOSITORY
  R296 KDeclarative

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D11960

AFFECTED FILES
  src/quickaddons/qtquicksettings.cpp

To: davidedmundson, #plasma
Cc: #frameworks, michaelh, ngraham
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