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bug#34763: 27.0.50; url-retrieve-synchronously misbehaves inside eldoc-d

From: Dmitry Gutov
Subject: bug#34763: 27.0.50; url-retrieve-synchronously misbehaves inside eldoc-documentation-function
Date: Tue, 12 Mar 2019 22:05:59 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:66.0) Gecko/20100101 Thunderbird/66.0

On 12.03.2019 20:00, Eli Zaretskii wrote:
Isn't the above expected, given the recipe?  You are initiating an
HTTP retrieval inside while-no-input, and then provide input which
aborts the retrieval.  What else can we expect from this code?

I'm looking at two distinct things at once:

- The requests to be aborted in time without extra stutters or alarming messages. - The requests to complete promptly enough if I don't abort them. E.g. type 'a' and just wait for "done" to show up in the echo area.

The scenario I described triggers, in my testing, problems in both of them. The first item seems fixed with your patch.

The second is more or less unchanged. It's fairly likely an orthogonal problem, and this is just the way I've found to trigger it. I can file a new report, if you like.

To reiterate, the way to reproduce the problem:

- Evaluate the file attached to the report and do some typing, as though to reproduce the first problem.

- Continue typing, pause from time to time and wait for "done" to show up in the echo area. After a little while, it will stop arriving, because the requests will stall for some reason.

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