bug#54028: Window is not a valid window

[martin rudalics]

> I don't know if the author of
> 
https://www.reddit.com/r/emacs/comments/sthusa/window_xxx_is_not_a_valid_window_on_switching_tabs/
> will report the bug here,

Please encourage the author again to report such bugs here.

> but since it's easily reproducible,
> here is the short test case, just evaluate this:
>
> (window-state-put
> ...
>   nil 'safe)
>
> It fails with:
>
>    Debugger entered--Lisp error: (error "#<window 9> is not a valid window")
>      error("%s is not a valid window" #<window 9>)
>      window-normalize-window(#<window 9>)
>      window-deletable-p(#<window 9>)
>      window-state-put

I think the attached fixes it, please check.  I have no idea whether the
state is restored as intended, though.

Thanks, martin

window-state-put.diff
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