emacs 24.3.1: output from async-shell-command is not always displayed

[Filipp Gunbin]

Here are the steps to reproduce.

M-& echo "sleep 1; ps &" > /tmp/1.sh

Then M-& /tmp/1.sh (few times).

On my machine, sometimes it gives the output in the *Async Shell
Command* buffer, sometimes not.  Without "sleep 1" the output is
displayed almost always.

M-! /tmp/1.sh displays the output always.

Filipp

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