bug#71117: 30.0.50; output of describe-function

[Juri Linkov]

>> May it be possible to switch the button, like:
>>
>> "list is defined in ‘C source code’, a ‘primitive-function’".
>
> Might you be interested in 's', bound to 'help-view-source'?  Won't
> solve the "force-of-habit" problem, but I find it rather convenient: no
> need to TAB to the button; hopefully future-proof as redesigns wash over
> *Help*.  I've found it worth the brain re-wiring.

Except there is a bug that prevents 's' from handling some C variables, e.g.:

0. emacs -Q
1. C-h v minibuffer-allow-text-properties RET
2. s

fails with

  (error "Don’t know where ‘minibuffer-allow-text-properties’ is defined")

So still need to use 'TAB RET' to navigate to C source.