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bug#39015: `isearch-complete1' should use `completion-at-point' or `comp

From: Juri Linkov
Subject: bug#39015: `isearch-complete1' should use `completion-at-point' or `completion-in-region'
Date: Mon, 20 Jan 2020 02:27:06 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.60 (x86_64-pc-linux-gnu)

> Not sure why in the first place `isearch-complete1' uses some custom
> auto-completion implementation that is different from a conventional
> solution, perhaps historical reasons.  Thus, I believe that reusing either
> `completion-at-point' or `completion-in-region' to implement that
> functionality is much better in the long run.  This would also allow
> packages, which customize completion behavior, to hook into `isearch'
> auto-completion as well.  See also [1] for example.
> [1] https://github.com/abo-abo/swiper/issues/1882

Based on this solution
it should be possible to write a patch that would hook into `isearch'
auto-completion.  I seems I can't do this since I don't understand
how to test it.

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