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bug#39658: 26.3; can't edit file with terminal escape sequences


From: frederik
Subject: bug#39658: 26.3; can't edit file with terminal escape sequences
Date: Tue, 18 Feb 2020 08:58:50 -0800

Thank you Mattias for figuring that out, and Eli for being more patient than I.

I think I'll let the professionals handle it from here.

On Tue, Feb 18, 2020 at 05:02:29PM +0100, Mattias Engdegård wrote:
My guess is that rendering the escape sequences in the problem file is causing 
some kind of quadratic complexity.

It looks like it's the left square brackets ('['). Take them out and it's fast.


On Tue, Feb 18, 2020 at 06:08:55PM +0200, Eli Zaretskii wrote:
Date: Tue, 18 Feb 2020 05:48:59 -0800
From: address@hidden

To reproduce, open the attached file in Emacs, and type C-x C-n. On my system 
Emacs uses 100% of CPU, indefinitely.

On my system, visiting this file takes 36 sec of CPU time.  Which is
long, but is not indefinitely.

If someone wants to investigate this case, I'd start with visiting the
file after "M-x profiler-start".  Then look at the hot spot(s).







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