bug#28403: 25.2; find-tag works, but xref-find-definitions

[Eli Zaretskii <eliz@gnu.org>]

> Date: Mon, 11 Sep 2017 01:02 EDT
> From: Winston <wbe@psr.com>
> Cc: dgutov@yandex.ru, 28403@debbugs.gnu.org
> 
> Eli asked:
> > I guess we can now close the bug report?
> 
> From my standpoint, yes.

Thanks, done.

> xref-find-definitions differs from find-tag several ways:
> * find-tag always prompted for a name, with the string at (point) as
>   the default name.  With no argument, xref-find-definitions does not
>   prompt, and tries immediately to go to a tag with that default name.
>   Use (setq xref-prompt-for-identifier t) to force prompting. 
> * find-tag allowed partial names.  xref-find-definitions does not.
>   Use TAB after a partial name in a prompt for completion(s).
> * If find-tag finds your tags OK but xref-find-definitions does not, you
>   may need to use --regexp with etags to help it identify the tag name.
>   (See etags man page.)  If even that doesn't help, try
> 							{whatever Dmitry
>   and Eli decide is a good long-term easy way to add '(tag-symbol-match-p)
>   to etags-xref-find-definitions-tag-order}.

Thanks.  Some of this is already in the documentation, other parts
will be if/when the code does what we are discussing now.