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Consistency for xref-show-{xrefs,definitions}-function

From: Gabriel do Nascimento Ribeiro
Subject: Consistency for xref-show-{xrefs,definitions}-function
Date: Thu, 14 Jan 2021 17:27:27 -0300

I noticed that the options 'xref-show-xrefs-function' and
'xref-show-definitions-function' are not symmetrical.

The defcustom for 'xref-show-xrefs-function' does not have type choices
as 'xref-show-definitions-function' has. Furthermore, it's quite strange
to configure it as follow:

(setq xref-show-xrefs-function

I suggest to create similar functions for 'xref-show-xrefs-function',
which at this moment can be just aliases but can be independent
functions in the future, if necessary:
  - xref-show-xrefs-buffer
  - xref-show-xrefs-buffer-at-bottom
  - xref-show-xrefs-completing-read

Also, the docstrings of both options could be improved a little bit to
give more information about the default choices.

I can submit a patch if these suggestions are accepted.


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