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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, 26 Oct 2018 09:41:02 +0200

>> 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.
> I can't find out how '(nil nil nil)' gets into the prev-buffers,

Did you try what I proposed?  If that doesn't catch it, I have no
idea.  IIUC mark_discard_killed_buffers just removes entries from that
list, it cannot introduce any nil valued elements.

> so to avoid the error, I propose to install this patch:

Well this will just cache the underlying problem.  But I have no good
idea how to investigate this issue any furher, so install if you like.


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