Fixed: the focusable CDockWidget would lose focus when another QWindow containing a CDockManager that contains a focusable CDockWidget gains focus

[Wing-summer]

This bug occurs when one application contains more than one CDockManager. Bug fix as the title says, the demo image as follows:

note the TAB COLOR CHANGE (the focused tab have top and right boder with light blue color)

before:

https://github.com/user-attachments/assets/5f9cdb31-be3d-4852-a54f-036edd4bb579

after:

https://github.com/user-attachments/assets/e523b7f2-b492-416e-a45c-366c6e00d306