[REG Qt 5.6.0 -> Qt 5.6.1] Designer: Wrong display of object when dragging when High DPI scaling is active

1. Run a Creator built on Qt 5.7.0.
2. Create a new Qt Widgets Application.
3. Open mainwindow.ui in Design mode.
4. Drag an object from the library on the left into the window preview.
   While you drag the object, it is displayed in the wrong size and mostly black. See the attached video.

While dragging, the object should look the way it's going to look in the preview window. With a Creator built on Qt 5.6.0 as well as with the standalone Widget Designer from Qt 5.7.0, this seems to work correctly.

Happens in standalone Designer as well when setting one of the scaling variables (as does Creator). Worst of all, widgets change size when moving them on the form.