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From: Glenn Morris <rgm@gnu.org>
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Subject: filter-buffer-substring loss of NOPROPS argument
Date: Fri, 03 Feb 2012 22:54:26 -0500
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There is no NEWS entry about this (incompatible) change:

2010-05-02  Stefan Monnier  <monnier at iro.umontreal.ca>

* simple.el [...] (filter-buffer-substring): [...]
  Remove unused arg `noprops'.

I don't know in what sense this argument was "unused".
It was used in a few places in Emacs at that time (eg emulation/cua-gmrk.el).

It is still used in the emacs-lisp-intro, although not in an important
way.