Windows sub window resize issue

In both QtQuick and QtWidgets on Windows there is an issue where any sub window will be resized if the parent window is moved or resized. This issue does not occur on MacOS.

See the following gif that demonstrates the issue. On the left side is a very simple QtQuick project and on the right is a very simple QtWidgets project (see attached files for code). As the top level window is moved or resized you should see that the sub window shrinks.

I also noticed that on MacOS the sub windows will not follow the parent window but on Windows it does.

Setting the `transitentParent` to null makes no difference for QtQuick but the issue does not appear for QtWidgets without setting the `transitentParent`.