bug#43070: Substitute buttons and 'help-echo property

[Lars Ingebrigtsen]

Stefan Kangas <stefan@marxist.se> writes:

> You have a patch in this thread which was never pushed:
>
>     https://lists.gnu.org/archive/html/emacs-devel/2019-10/msg00215.html
>
> Could you please push this patch to master?  AFAICT, everyone agreed
> that it should be pushed.
>
> This bug is a followup to:
>
>     https://debbugs.gnu.org/cgi/bugreport.cgi?bug=37628

Makes sense to me, so I've applied Basil's patch to Emacs 28.

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