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As @drew asked me to do here I'm asking one question per problem

I'm trying to enable/disable visual-fill-column when there is one window/multiple windows.

(defun my-visual-fill-one-window ()
  (global-visual-fill-column-mode -1)
  (if (one-window-p)
      (global-visual-fill-column-mode 1)
    (global-visual-fill-column-mode -1)
    )
  )

(add-hook 'window-state-change-hook 'my-visual-fill-one-window)

Treemacs stops working (I can't open its window) with the following error:

treemacs--popup-window: Wrong type argument: window-live-p, nil

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