bug#18133: Suppressing asynchronous command output

[Reuben Thomas]

Attached, a patch for this bug.

It makes hiding the output buffer until there is output the default behavior; if the user wishes to get the old behavior back, then display-buffer-alist can be customized to remove the new default element.

If this patch is acceptable, I can add a NEWS item and install it.

As a side effect, the process object is now made available to input and output filter functions.

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http://rrt.sc3d.org

0002-Delay-showing-Async-Shell-Command-buffer-until-outpu.patch
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