bug#19392: Emacs searches for dabbrevs in archive buffers

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> Note that Emacs only searches other buffers if it cannot find matches
> in the current one, or exhausts the ones from the current buffer.  And
> we already support dabbrev-select-buffers-function,
> dabbrev-ignored-buffer-names, and dabbrev-ignored-buffer-regexps,
> which could fine-tune which other buffers are searched.

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.

I think that could be easily implemented by allowing modes to set a
buffer-local variable like `dabbrev-ignore-buffer'.  I can see arc/tar
mode doing that, and perhaps image-mode, too?

-- 
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   bloggy blog: http://lars.ingebrigtsen.no