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    Bug 
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    Resolution: Done
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    P1: Critical 
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    5.3.0
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    None
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    Window 8.1
 Linux
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        0bc54d362e9f11c8bca8e8d5415d3a112896fb84 906cf6ce32604dc71d3e5b33f2de2f0046e252ff
Build attached project (turn off "Shadow Build"!).
Run project and try to drag&drop file from Explorer to window - window should change color from white to red.
Works fine in Qt 5.2.1 with QWidget::createWindowContainer(), instead of QQuickWidget.