In Emacs 25, substitute-command-keys removes text properties of strings
containing quotes:
> In Emacs 25:
(substitute-command-keys (propertize "`a'" 'prop 'val))
"‘a’"
> In Emacs 24.5:
(substitute-command-keys (propertize "`a'" 'prop 'val))
#("`a'" 0 3 (prop val))
As Eli pointed out on the mailing list,
> Anything that is substituted has its test properties removed:
>
> (substitute-command-keys (propertize "\\[forward-char]" 'prop 'val))
> => "C-f"
>
> The above is from Emacs 24.5.
>
> I think patches are welcome to reinstate the properties.
This is an issue in particular for docstrings:
(defcustom my/pretty/set/option nil
"Demo text properties in customize."
:group 'emacs
:type `(set (const :tag ,(concat (propertize "Title of option 1 (bold on both
24.5 and 25)" 'face '(:weight bold))
"\n "
(propertize "Docs of option 1, in a smaller
font on both 24.5 and 25." 'face '(:height 0.9))))
(const :tag ,(concat (propertize "Title of option 2 (`bold' on
24.5 but not 25)" 'face '(:weight bold))
"\n "
(propertize "Docs of option 2, in a smaller
font on 24.5, but not 25." 'face '(:height 0.9))))))
This example uses text properties on `:tag's to make the customize buffer more
readable. This works fine in GNU Emacs 24.5, but it stopped working on master
(and emacs-25), because of substitute-command-keys replacing quotes and as a
side effect dropping text properties.
Clément.
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