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bug#32850: 27.0.50; window-swap-states doesn't swap window prev/next-buf

From: martin rudalics
Subject: bug#32850: 27.0.50; window-swap-states doesn't swap window prev/next-buffers
Date: Fri, 19 Oct 2018 09:40:38 +0200

> I found a problem, it occurs very rarely:
> Debugger entered--Lisp error: (wrong-type-argument stringp nil)
>    get-buffer(nil)
>    #f(compiled-function (entry) #<bytecode 0x22c739>)((nil nil nil))
>    mapcar(#f(compiled-function (entry) #<bytecode 0x22c739>) (("*Group*" 1 139) (nil 
nil nil) ("*sent reply to martin rudalics*" 1 1090)))
>    window--state-put-2(safe 737)
>    window-state-put(...)
> Do you have an idea how did (nil nil nil) find its way into the list of
> prev-buffers?  (window-state-get was used with the non-nil WRITABLE arg)

The most simple way to find out is to define such a list in window.c
and have 'set-window-prev-buffers' holler if the prev_buffers argument
is equal to that list.


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