GNU bug report logs - #44818
Say "Consider switching so-long mode on" when detecting long line files

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Message #25 received at 44818 <at> debbugs.gnu.org (full text, mbox):

From: Devon Sean McCullough <Emacs-hacker2018 <at> jovi.net>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 44818 <at> debbugs.gnu.org
Subject: Re: bug#44818: 27.0.91; wedged
Date: Tue, 24 Nov 2020 20:35:00 -0500

On 24/11/2020 13:48, Eli Zaretskii wrote:
>> Cc: 44818 <at> debbugs.gnu.org
>> From: Devon Sean McCullough <Emacs-hacker2018 <at> jovi.net>
>> Date: Tue, 24 Nov 2020 13:42:03 -0500
>>
>> P.S.  Could a watchdog timer safely abort such wedgitude?
> 
> That would have to run in a separate thread, right?
> 
> But what timeout to set it to? some jobs might legitimately take some
> time.  And then what to do when the timer expires?

The job of redisplay cannot legitimately take > 50 milliseconds.
When the user repeatedly tries ^G quit but Emacs is unresponsive
because of redisplay, such redisplay must be prevented while the
user is offered options to regain control.

		Peace
			--Devon

P.S. Could an invisibility overlay offer temporary relief?
Perhaps a red screen of redisplay death with a short menu?

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