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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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    Window 8.1
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        1bae226076b37ba925bf810639e1674130ad622a
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
(Related to QTBUG-39167)