fix(fontlock): fontify parameters in multiline arglist

Author: Fuco1

typescript-mode.el

@@ -1859,11 +1859,12 @@ and searches for the next token to be highlighted."
     ,(list
       (concat
        "\\_<function\\_>\\(\\s-+" typescript--name-re "\\)?\\s-*\\(<.*>\\)?\\s-*(\\s-*"
-       typescript--name-start-re)
-      (list (concat "\\(" typescript--name-re "\\)\\(\\s-*).*\\)?")
-            '(backward-char)
-            '(end-of-line)
-            '(1 font-lock-variable-name-face)))
+       "\\(?:$\\|" typescript--name-start-re "\\)")
+      `(,(concat "\\(" typescript--name-re "\\)\\(\\s-*).*\\)?")
+        (prog1 (save-excursion (re-search-forward ")" nil t))
+          (backward-char))
+        nil
+        (1 font-lock-variable-name-face)))
 
     ;; continued formal parameter list
     ,(list