GNU bug report logs - #34621
[PATCH] lisp/progmodes/grep.el (grep-read-files): Add file-directory-p check

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From: Christopher Thorne <c.thorne <at> reckondigital.com>
To: 34621 <at> debbugs.gnu.org
Cc: Drew Adams <drew.adams <at> oracle.com>
Subject: bug#34621: Patch Update
Date: Tue, 05 Mar 2019 18:22:15 +0000

> It doesn't sound to me like this has anything, per se,
> to do with Dired.  It has to do with how the default is
> determined, and that's apparently now being picked up
> from the buffer name.

Hmm, I think you're right that this isn't just isolated to dired. For 
example, I can start a shell-mode buffer, rename it to shell.txt and 
rgrep will now suggest "*.txt" as the default extension even though my 
buffer is unrelated to .txt files.

An alternative I considered is only showing extension suggestions for 
buffers that are associated with a file (i.e. buffer-file-name is a 
non-empty string). Can you think of any cases where this would fall 
down?

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