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bug#13594: 24.2.92; [PATCH] compilation-start doesn't consider nil OUTWI

From: Stefan Monnier
Subject: bug#13594: 24.2.92; [PATCH] compilation-start doesn't consider nil OUTWIN
Date: Thu, 07 Feb 2013 08:36:56 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux)

> will return nil (since nil is a valid return value it's a bug when callers
> of `display-buffer' don't check for nil, these callers should be fixed).

It's a valid return value, but only when display-buffer is *unable to
display the buffer*.  It is *very* rare to be unable to do so.  E.g. it
will never happen unless at least one of pop-up-frame-function or
display-buffer-fallback-action is changed.

So it's no wonder that most callers don't bother checking for a nil
return value.

Maybe a way around that is to use a special window that's never
displayed.  But that might introduce more trouble than it's trying
to solve.


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