bug#25549: 25.1; eshell grep gives inconsistent output

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tags 25549 = confirmed
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Tijs Mallaerts <tijs.mallaerts@gmail.com> writes:

> On my machine following steps seem to be a reproducible test case:
>
> - create a file "test-file.txt" with 20.000 identical lines with content 
> "This is a line."
> - open eshell and insert the command: cat test-file.txt | grep line | wc
>
> This seems to return a different result every time it's run.

Thanks, I can reproduce with this.