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From: Mathias Dahl <mathias.dahl@gmail.com>
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Subject: Re: copy visible text with some lines hidden with hide-lines
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jdzhang@gmail.com writes:

> I need looking at large (10s of MB) log files regularly. I use hide-
> lines to filter out the lines I don't care. However, I was able to
> figure out how to copy only the text being displayed. Any suggestions
> are welcome.

You could try using `flush-lines' instead, it removes the lines (don't
save the buffer though, then they will be gone).