bug#32389: Default behaviour of xref-find-references is inconsistent with the documentation

[Eli Zaretskii]

> From: Shitikanth <shitikanth1@gmail.com>
> Date: Tue, 7 Aug 2018 23:45:42 +0530
> 
> I, for one, feel that this has become more complex than it needs to be. Since 
> C-u M-?
> gives the option to force a prompt anyway, the default behaviour should be 
> for M-?
> to not show a prompt unless needed (that is if the xref-backend is not able 
> to find
> an identifier at point). 

You are arguing for a change in the default behavior, something that
we don't usually do based on a single opinion.  You can always
customize xref-prompt-for-identifier on your system to get this
behavior for yourself; changing that for everyone requires some kind
of user poll, at least.