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From: Juri Linkov <juri@linkov.net>
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Subject: bug#30280: async-shell-command-display-buffer doesn't work anymore
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Xref: news.gmane.org gmane.emacs.bugs:142632
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0. emacs -Q
1. Eval: (setq async-shell-command-buffer 'new-buffer
               async-shell-command-display-buffer nil)
2. M-& sleep 3600
3. M-& sleep 3; echo "xyzzy"

At the step 2 =E2=80=9C*Async Shell Command*=E2=80=9D is not shown becaus=
e of no output,
this is ok.

But at the step 3 =E2=80=9C*Async Shell Command*<2>=E2=80=9D is not shown=
 after 3 seconds
when the output arrives, this is a regression.

It seems it is caused by commit#9f4f130 from bug#28997

PS: Also it doesn't work with less official configuration:
0. emacs -Q
1. Eval: (setq async-shell-command-display-buffer nil)
         (add-hook 'shell-mode-hook 'rename-uniquely)
2. M-& sleep 3600
3. M-& sleep 3; echo "xyzzy"