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Why does show_help_echo call substitute_command_keys?

From: Clément Pit-Claudel
Subject: Why does show_help_echo call substitute_command_keys?
Date: Thu, 20 Jul 2017 19:05:45 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1

Hi emacs-devel,

I'm puzzled by this bit of code in show_help_echo:

  if (STRINGP (help) || NILP (help))
      if (!NILP (Vshow_help_function))
        call1 (Vshow_help_function, Fsubstitute_command_keys (help));
      help_echo_showing_p = STRINGP (help);

This is causing trouble in Flycheck, because we set help-echo properties on 
error spans and we expect them to be displayed without modifications when users 
hover over them.  Is there a way to disable command-key- (and quote-) 
substitution in help-echo strings?

Concrete example:

(with-current-buffer (get-buffer-create "A")
  (insert "AAA")
  (put-text-property (point-min) (point-max) 'help-echo "Expected a 'list<'a>', 
got a 'pair<'a,'a>'")
  (pop-to-buffer (current-buffer)))

(put your mouse on the "AAA" part, and notice that the quotes were substituted)


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