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bug#35784: emacs 26 crash

From: Eli Zaretskii
Subject: bug#35784: emacs 26 crash
Date: Sat, 18 May 2019 20:43:09 +0300

> Cc: address@hidden, address@hidden
> From: martin rudalics <address@hidden>
> Date: Sat, 18 May 2019 19:30:50 +0200
>  > This seems to imply that we are trying to update a non-leaf window,
>  > something that should never happen.  There's no Lisp-level backtrace,
>  > so it's hard to tell what Lisp called force-window-update, and how the
>  > window in question became non-leaf, but maybe some crazy Lisp hook
>  > switched windows behind redisplay's back or something.
> I'd rather guess that this is the result of 'kill-buffer' called from
> 'delete-frame-functions' or 'delete-frame' called from
> 'kill-buffer-hook'.

kill-buffer is supposed to replace the killed buffer with another in
all windows, so we shouldn't end up with a window's buffer being nil.
But I'm louse at guessing causes for problems just by looking at them,
so you may be right.

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