Qt 5.5.1 has problem to "[QTBUG-50081] Crash in QXcbWindow::setParent() due to NULL xcbScreen()".
This is already fixed in upstream. https://bugreports.qt.io/browse/QTBUG-50081
Qt 5.5.1 has problem to "[QTBUG-50081] Crash in QXcbWindow: :setParent( ) due to NULL xcbScreen()".
This is already fixed in upstream. /bugreports. qt.io/browse/ QTBUG-50081
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