Fix interaction between url-handler-mode and browse-url

* lisp/net/browse-url.el (browse-url): Don't expand any URLs (like
"man:") that have a scheme when using `url-handler-mode' (bug#37056).

lisp/net/browse-url.el

@@ -781,7 +781,9 @@ as ARGS."
   (interactive (browse-url-interactive-arg "URL: "))
   (unless (called-interactively-p 'interactive)
     (setq args (or args (list browse-url-new-window-flag))))
-  (when (and url-handler-mode (not (file-name-absolute-p url)))
+  (when (and url-handler-mode
+             (not (file-name-absolute-p url))
+             (not (string-match "\\`[a-z]+:" url)))
     (setq url (expand-file-name url)))
   (let ((process-environment (copy-sequence process-environment))
 	(function (or (and (string-match "\\`mailto:" url)