Logical content size of window should be kept on screen changed

Currently, we keep the same device pixel size on a window on moved to a screen with different scale factor.
The DP size of a window with a logical size 400x400 on a screen with scale factor 2 is 800x800.
We do not change any size on the window screen changed, thus on a move to screen with factor 1.0 the logical size will be 800x800. Visually it means that the window will look twice bigger and there will be four times more content.

It is arguable whether the suggested behaviour is actually wanted.