bug#9917: bug#5042: bug#9917: 24.0.90; Make `goto-line' consistent with the line number from the minibuffer

[Juri Linkov]

> This is what for example help-function-def--button-function does:
>
>             ;; Widen the buffer if necessary to go to this position.
>             (when (or (< position (point-min))
>                       (> position (point-max)))
>               (widen))
>             (goto-char position)
>
> Unfortunately, xref doesn't provide such nice feature,
> so 'M-.' fails to navigate in a narrowed buffer.

Here is the fix for xref:

diff --git a/lisp/progmodes/elisp-mode.el b/lisp/progmodes/elisp-mode.el
index eed73f5791..c7ff351845 100644
--- a/lisp/progmodes/elisp-mode.el
+++ b/lisp/progmodes/elisp-mode.el
@@ -897,8 +897,10 @@ xref-location-marker
     (let ((buffer-point (find-function-search-for-symbol symbol type file)))
       (with-current-buffer (car buffer-point)
         (save-excursion
-          (goto-char (or (cdr buffer-point) (point-min)))
-          (point-marker))))))
+          (save-restriction
+            (widen)
+            (goto-char (or (cdr buffer-point) (point-min)))
+            (point-marker)))))))
 
 (cl-defmethod xref-location-group ((l xref-elisp-location))
   (xref-elisp-location-file l))