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Re: add-face-text-property destructively modified properties


From: Stefan Monnier
Subject: Re: add-face-text-property destructively modified properties
Date: Wed, 09 Oct 2019 17:45:54 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

> Up until yesterday, using this function on copies of strings would
> modify the original string:

Indeed.  There was an open bug report about that (sorry, don't have the
bug-nb at hand).

> Eli wanted comments about whether anybody thinks this is a surprising
> change.

I think it was a plain bug.  The old behavior was
definitely surprising. 

What is surprising about the change is that it took so long to come ;-)


        Stefan




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