bug#47589: [PATCH] 27.1; Freeze on long lines in compilation-shell-minor-mode

[Lars Ingebrigtsen]

Anton Tayanovskyy <anton.tayanovskyy@gmail.com> writes:

> The patch edits the function to use a limited version of
> `re-search-forward`. Instead of finding the pattern everywhere, it only
> looks for the pattern in the first 1024 chars of every line. It seems
> plausible that real-world compiler warnings would sit close to the
> beginning of lines.
>
> With the patch the experience (in combination with global-so-long-mode)
> becomes tolerable; while not lightning fast, Emacs is a lot more
> responsive in this situation and I as a user retain control to fix the
> problem, such as comint-clear-buffer etc.

I think that's an interesting approach to this problem.  I seem to
recall there being some work in this area, though, and I'm not able to
see the slowdowns in the example given here (even if I increase the
number hugely).

Would it be possible for you to test Emacs 28 and see whether you still
see the problem there?

-- 
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   bloggy blog: http://lars.ingebrigtsen.no