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Bug
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    Resolution: Out of scope
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P2: Important
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    None
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    5.6.0 Beta
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    None
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    Windows 10 x64 - Qt Creator 3.6.1 - Qt 5.6.0 Beta - MSVC 2013, x32
 
I have open the same problem here (for Qt 5.5) :
https://bugreports.qt.io/browse/QTBUG-48695
I tested with Qt 5.6 Beta/Windows 10 x64 and i have the same problem.
When I use the Combox : the screen flickering and you can not use Combox.
How :
1) Open "Styles" project demo (Qt\Exemples\Qt-5.5\quick\controls\styles\styles.pro).
2) Add "visibility: Window.FullScreen" in "main.qml" after "Windows {".
3) Compile and run.
4) Use the Combox : the screen flickering and you can not use Combox...
Note: many projects demo as this problem when the visibility is set to FullScreen...
- relates to
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QTBUG-55185 Fullscreen QML application flickers if dialog is shown
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 - Reported
 
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QTBUG-68266 Restoring window with Qt::FramelessWindowHint causes flickering
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 - Reported
 
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QTBUG-45861 QML FullScreen with Flickable if active the app, the window will flick
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 - Closed
 
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