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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Render a buffer or string to a simpler string?
Date: Sat, 25 May 2013 23:58:01 +0300
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> From: Dmitry Gutov <dgutov@yandex.ru>
> Date: Sat, 25 May 2013 23:36:52 +0400
> 
> Is there an easy way to convert a string with `line-prefix' and,
> optionally, `prefix' and `display' properties to a string without those
> properties corresponding to how the former string is going to be
> displayed?

Why do you need that?  What do you need to accomplish that needs such
a strange feature?