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bug#25209: 25.1; can't delete *Shell Command Output*


From: Andreas Schwab
Subject: bug#25209: 25.1; can't delete *Shell Command Output*
Date: Mon, 19 Dec 2016 15:26:37 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1.90 (gnu/linux)

On Dez 19 2016, Andreas Schwab <address@hidden> wrote:

> On Dez 15 2016, Francesco Potortì <address@hidden> wrote:
>
>> On a long-running multi-tty Emacs, at one point the *Shell Command
>> Output* buffer refuses to go away.
>>
>> If I try to kill it, nothing happens, whether the current buffer is that
>> one or any other one.  The contents of the *Shell Command Output* buffer
>> are always visible in the minibuffer.  So, to make it unobtrusive, I
>> need to issue an
>>  M-! echo -n RET
>> every time the *Shell Command Output* buffer is dirtied.
>
> Did you perhaps quit while the output of a shell-command was being
> displayed, because it took too long?  In that situation Emacs can end up
> in a state where (minibuffer-window) points to the *Shell Command
> Output* buffer, and kill-buffer will refuse to kill the buffer.

I think the problem is that vertical-motion (as called by
display-message-or-buffer via count-screen-lines) is not properly
protecting against quit when it temporarily modifies the window's
buffer.

Andreas.

-- 
Andreas Schwab, address@hidden
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."





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