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add-face-text-property destructively modified properties

From: Lars Ingebrigtsen
Subject: add-face-text-property destructively modified properties
Date: Wed, 09 Oct 2019 20:14:26 +0200
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:

  (setq str1 (propertize "foo" 'face '(underline highlight)))
  (setq str2 (concat str1))
  (add-face-text-property 0 3 'foobar t str2)
  (pp str1 (current-buffer)))

#("foo" 0 3
   (underline highlight foobar)))

This didn't seem right to me, so I modified it to not do that, but only
modify str2 when I told it to modify str2.

Eli wanted comments about whether anybody thinks this is a surprising

(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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