QWizardPage does not support High-DPI Watermark Pixmaps

If a watermark pixmap with a DevicePixelRatio of 2.0 is set for a QWizardPage, then the layout of the page reserves too much space for the pixmap. For example if the size of a watermark pixmap is 100 x 100 px, we can provide a high DPI version of this pixmap with 200 x 200 px and a DevicePixelRatio of 2.0. In this case, the QWizardPage layout reserv 2.0 * the space required. The following picture and the provided minimal example show this problem:

If we use a pixmap with a DevicePixelRation of 1.0, then everything is ok:

So it is not possible to use high-DPI pixmaps in QWizardPages.