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bug#19457: 24.4; exec_sentinel_error_handler and read_process_output_err

From: Dmitry Gutov
Subject: bug#19457: 24.4; exec_sentinel_error_handler and read_process_output_error_handler
Date: Mon, 05 Jan 2015 02:43:20 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:33.0) Gecko/20100101 Thunderbird/33.0

On 01/01/2015 07:29 PM, Stefan Monnier wrote:

Back then I tried to come up with some alternative API that would
provide directly the ability to share more work, but couldn't come
up with anything that was really better than just using straight caching
in the backend.

A straightforward caching approach (like `completion-table-with-cache') won't be good enough, though: the completion styles that come later tend to query with shorter prefixes.

So all in all, it seems like the caching function has to return completions for an empty prefix, and then cache that. That might be pretty costly at times.

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