[Windows] Closing saved Window using the "X" at the top right removes it from the tree.

[CCU-KSU]

Before switching to Linkmap, I used Tab-Outliner, and one thing it did that I absolutely loved was that if you were to close a previously saved window using the "X" at the top of the window, the saved window would remain in the tree.

Reproduction (When I say "window", I am not referring to the Link-Map window)

1. Create a new window.
2. Using Link-Map, name windows using pencil icon.
3. Using Link-Map, close window using "X" button (Not the one at the one at the top of the window)
4. Using Link-Map, re-open the named window.
5. Close the window using the "X" button in the top right corner of the window.

[Expected behavior] Window closes and its entry in the tree remains.
[Actual behavior] Window closes and its entry in the tree is removed.

demo.mp4