* lisp/progmodes/xref.el (xref-history-storage):
New user option (bug#59381).
(xref--make-xref-history): New function.
(xref--history): Use it.
(xref-global-history, xref-window-local-history): New function.
(xref--get-history): New function.
(xref--push-backward, xref--push-forward)
(xref-push-marker-stack, xref-go-back, xref-go-forward)
(xref-clear-marker-stack, xref-marker-stack-empty-p)
(xref-forward-history-empty-p): Use it.