qquickanimationcontroller sometimes fails

 Autotest `tst_qquickanimationcontroller' failed for macx-clang
 developer-build OSX 10.7 :(

   QOpenGLContext::swapBuffers() called with non-exposed window, behavior is undefined
   Testing qquickanimationcontroller
   FAIL!  : qquickanimationcontroller::AnimationController::test_complete() 'verify()' returned FALSE. ()
      Loc: [/Users/qt/.pulse2-agent/data/recipes/187514149/base/qt/qtdeclarative/tests/auto/quick/qquickanimationcontroller/data/tst_completion.qml(27)]
   Totals: 53 passed, 1 failed, 0 skipped
   QtQA::App::TestRunner: test failed, running again to see if it is flaky...
   QOpenGLContext::swapBuffers() called with non-exposed window, behavior is undefined
   Testing qquickanimationcontroller
   FAIL!  : qquickanimationcontroller::AnimationController::test_complete() 'verify()' returned FALSE. ()
      Loc: [/Users/qt/.pulse2-agent/data/recipes/187514149/base/qt/qtdeclarative/tests/auto/quick/qquickanimationcontroller/data/tst_completion.qml(37)]
   Totals: 53 passed, 1 failed, 0 skipped
   QtQA::App::TestRunner: test failure could be reproduced twice consecutively
   QtQA::App::TestRunner: end [./tst_qquickanimationcontroller] [-silent] [-o] [/Users/qt/.pulse2-agent/data/recipes/187514149/base/_artifacts/test-logs/tst_qquickanimationcontroller-testresults-00.xml,xml] [-o] [-,txt], 6 seconds, exit code 1