bug#19392: Emacs searches for dabbrevs in archive buffers

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

>> We do have all of that, but I think that it would be reasonable (by
>> default) for `dabbrev--select-buffers' to ignore these "binary"
>> buffers.  Because the data there is mostly noise.
>
> If you want to do that, why not just add the appropriate regexp(s) to
> dabbrev-ignored-buffer-regexps?

It's a user option, so we shouldn't add things to it dynamically, but we
could add a default that excludes these files.  The problem is, though,
that that would be a very complex regexp matching everything that
arc/tar/image modes covers, which is quite a lot.

The user option thing also goes for `dabbrev-ignored-buffer-names'.

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