bug#1973: Bug in simple.el (Emacs version 22.2.1)

[Sebastian Tennant]

Quoth Sebastian Tennant <sebyte@smolny.plus.com>:
> No one likes to see the guts of a function (local variable 'proc') in
> their mode hooks.

This isn't so ugly.

 http://article.gmane.org/gmane.emacs.help/61630

> The whole thing's a bit of a mess if you ask me.

Apologies for the rant!  I don't know if you agree with any of it but
one thing's for sure; adding async-shell-command-filter-hook to
simple.el (and documenting it) solves the problem without changing the
implementation of shell-command in any way - a win-win situation, no?

Sebastian
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