GNU bug report logs - #15045
Point jumps inappropriately around time of Semantic lexing

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From: Barry OReilly <gundaetiapo <at> gmail.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 15045 <at> debbugs.gnu.org, David Engster <deng <at> randomsample.de>, Eric Ludlam <eric <at> siege-engine.com>
Subject: bug#15045: Point jumps inappropriately around time of Semantic lexing
Date: Tue, 15 Oct 2013 10:12:32 -0400

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> The original problem is rare enough

You're wrong to call it rare. Dave Milter, David Engster, and I have
seen it separately. It has occurred because of tasks in Semantic,
Speck, and now NXML. That input-pending-p behaves this way is
apparently surprising to the Elisp developer. It is even more
surprising to the user upon witnessing such a jarring symptom.

> So I tend to agree with Barry that input-pending-p should not run
> timers. Not just based on his particular problem case, but on the
> basis of what ideally input-pending-p should do.

I don't claim the change solves the issue completely. This bug report
would have to stay open because Semantic also calls
accept-process-output while point is on an excursion.

Since Stefan had said input-pending-p behavior seems wrong, I followed
up in the hopes we can both correct a wrong and reduce how common this
user-visible symptom is.

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