The high-dpi painting for the buttons in the QMdiSubWindow was broken for the windowsvista style because an invalid widget was passed to the paint routines. This lead to a wrong calculation of the devicePixelRatio and in the end very blurry icons. Pick-to: 6.7 Fixes: QTBUG-127288 Change-Id: I0f604ddb4faf66a6e850a1504582076f22418fcd Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io> Reviewed-by: Axel Spoerl <axel.spoerl@qt.io> Reviewed-by: Wladimir Leuschner <wladimir.leuschner@qt.io> (cherry picked from commit 8b261a2ad7884f8fe7a93a678c9fce5052e42c98) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
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