Fix app icon button in window decos with high DPI in previews.
Summary: With both Qt devicePixelRatio > 1 and Qt::AA_UseHighDpiPixmaps set QIcon.pixmap() will return a bigger image than the size requested, with the relevant devicePixelRatio set. This code is trying to center an icon within a bounding rect, (like QStyle::drawItemPixmap) and so positioning should use normalised pixels, not actual pixmap pixels. This affected Systemsettings previews but not kwin. Reviewers: #plasma, mart Reviewed By: #plasma, mart Subscribers: mart, plasma-devel Tags: #plasma Differential Revision: https://phabricator.kde.org/D6763
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