Attaching to the central widget

[panda21127]

Dear colleagues.
I am asking you to solve my problem.
When trying to change the attachment areas for the central widget, I failed.

"The desired result"

"The result"

Subsequently, looking through the code, I discovered that perhaps the central widget does not have the ability to change the attachment areas.

"FloatingDockContainer.cpp, 593 line"

"FloatingDragPreview.cpp, 172 line"

I ask you to dispel my doubts and tell me how to implement this idea correctly.

With best wishes, user.

P.S, if you're wondering how I got the picture with the desired result, then the answer is simple: I temporarily edited the code to demonstrate what I want to get!