Feature Request: keep the size after a nearby dock area was closed

[Wing-summer]

Hello! I am the author of WingHexExplorer2. I use your qt ads as my docking system. I have a question about the policy as the title says:

Above as the image I want to demostrate the problem: I want to keep the size of the dock widget "日志" after the close of "WingHexExplorer2.exe : 1" ("WingHexExplorer2.exe" is added to the centeral dock widget area).

I have read your dev document but I find nothing to solve the problem. Can you give me some tips? Thanks!