* lisp/progmodes/xref.el (xref-location-column):
Create a generic from xref-file-location-column, to use in the
common rendering code (bug#36967).
(xref--insert-xrefs): Update accordingly.
* test/lisp/progmodes/xref-tests.el
(xref-matches-in-directory-finds-two-matches-on-the-same-line)
(xref-matches-in-directory-finds-an-empty-line-regexp-match):
Ditto.