bug#33870: 27.0.50; xref-goto-xref not configurable

[Juri Linkov]

Here's a better patch that relies on display-buffer-in-previous-window:

diff --git a/lisp/progmodes/xref.el b/lisp/progmodes/xref.el
index 87ce2299c5..169f49a348 100644
--- a/lisp/progmodes/xref.el
+++ b/lisp/progmodes/xref.el
@@ -482,19 +482,9 @@ xref--show-pos-in-buf
                   (window-live-p xref--original-window)
                   (or (not (window-dedicated-p xref--original-window))
                       (eq (window-buffer xref--original-window) buf)))
-                 `(,(lambda (buf _alist)
-                      (set-window-buffer xref--original-window buf)
-                      xref--original-window))))))
-    (with-selected-window
-        (with-selected-window
-            ;; Just before `display-buffer', place ourselves in the
-            ;; original window to suggest preserving it. Of course, if
-            ;; user has deleted the original window, all bets are off,
-            ;; just use the selected one.
-            (or (and (window-live-p xref--original-window)
-                     xref--original-window)
-                (selected-window))
-          (display-buffer buf action))
+                 `((display-buffer-in-previous-window)
+                   (previous-window . ,xref--original-window))))))
+    (with-selected-window (display-buffer buf action)
       (xref--goto-char pos)
       (run-hooks 'xref-after-jump-hook)
       (let ((buf (current-buffer)))