bug#39598: 26.3; Emacs is extremely unresponsive on a trivial python file

[Eli Zaretskii]

> From: Ivan Oreshnikov <oreshnikov.ivan@gmail.com>
> Date: Sat, 15 Feb 2020 19:49:37 +0100
> Cc: 39598@debbugs.gnu.org
> 
> > What is/are the real-life use case(s) where such long series of strings 
> > causes slowdown?
> 
> This is an intermediate state of python buffer when I am trying to build a 
> large-ish dictionary with lists of strings
> as a value.

Why do you need that intermediate buffer to be in Python mode?

> What I find a bit weird is that it only happens to a long series of bare 
> strings. If I construct an equally long
> proper python list of strings I don't see this behavior.

I guess because the code is tuned to support valid Python code, not
something that shouldn't happen in Python sources?