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From: Wilfred Hughes <me@wilfred.me.uk>
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Subject: Re: Making font-lock handle long lines better
Date: Sat, 11 Feb 2017 20:10:15 +0000
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> If you can attach to your report a minimal test
> case that exhibits the problematic behavior, it will be appreciated.

I have a minimal test case in
http://emacs.stackexchange.com/questions/598/how-do-i-prevent-extremely-long-lines-making-emacs-slow
which has a few useful suggestions for workarounds.

I think a line length limit would be a very worthwhile addition.

Wilfred