RE: Why does show_help_echo call substitute_command_keys?

[Drew Adams]

> > Because the help-echo property is the Emacs API to tooltips, and
> > tooltips are expected to be able to display keyboard equivalents to
> > clicking the thing that is pointed?
> 
> Ok. So we don't expect callers to explicitly use
> substitute-command-keys on their help-echo properties?

We should, if/when they want the effect of `substitute-command-keys'.

Emacs should not assume that `substitute-command-keys' is appropriate
for a tooltip.  Code that wants that behavior should ask for it.