bug#44983: Truncate long lines of grep output

[Lars Ingebrigtsen]

Dmitry Gutov <dgutov@yandex.ru> writes:

> FWIW, this is more or less solved for Xref output buffers these
> days. And the solution is based on the 'invisible' property.

Skimming the code there, it seems like xref just gets a list that it
inserts into the buffer, and then applies the invisibility spec to the
long lines?  That's a bit different from what compilation-mode/grep is
doing, where a process inserts text.  I.e., invisible text, in general,
works fine, but there's some bad interaction between
processes/invisible/font-lock somewhere.

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