Fix regexp in help-do-arg-highlight

* lisp/help-fns.el (help-do-arg-highlight): Fix regexp.  (Bug#65580)

Avoid highlighting (parts of) the function name as arguments in the
output of 'describe-function' when the function has an argument with
the same name.  To achieve this, refine the regular expression that
'help-do-arg-highlight' uses such that it doesn't match anything in
the function name.

diff --git a/lisp/help-fns.el b/lisp/help-fns.el
index 609bed18f2f9d8476067fc40a625a6345d53f1fc..b34778773a9e2cdd2d0c223edb6e47041c3f65f8 100644 (file)
--- a/lisp/help-fns.el
+++ b/lisp/help-fns.el
@@ -369,7 +369,8 @@ if the variable `help-downcase-arguments' is non-nil."
       (setq doc (replace-regexp-in-string
                  ;; This is heuristic, but covers all common cases
                  ;; except ARG1-ARG2
-                 (concat "\\<"                   ; beginning of word
+                 (concat "([^ ]+ .*"             ; skip function name
+                         "\\<"                   ; beginning of word
                          "\\(?:[a-z-]*-\\)?"     ; for xxx-ARG
                          "\\("
                          (regexp-quote arg)