bug#44983: Truncate long lines of grep output

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

>> I thought I remembered there was a way to say to font-lock "ignore this
>> bit of the buffer", but I can't find it now.  Do I misremember?
>
> Make the text invisible?

The text is covered by a display property, which should be much the same
thing. 

> If that doesn't help either, I suggest to profile the code, because it
> could be the slow display is due to something else.

Hm, yes...  even if I disable font-lock-mode, it's still slow.

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