* lisp/emacs-lisp/syntax.el (syntax-ppss-table): New var

(syntax-ppss):
* lisp/font-lock.el (font-lock-fontify-syntactically-region): Use it.

lisp/emacs-lisp/syntax.el

@@ -416,6 +416,9 @@ point (where the PPSS is equivalent to nil).")
 	      (error nil)))
 	  syntax-ppss-stats))
 
+(defvar-local syntax-ppss-table nil
+  "Syntax-table to use during `syntax-ppss', if any.")
+
 (defun syntax-ppss (&optional pos)
   "Parse-Partial-Sexp State at POS, defaulting to point.
 The returned value is the same as that of `parse-partial-sexp'
@@ -431,6 +434,7 @@ running the hook."
   (unless pos (setq pos (point)))
   (syntax-propertize pos)
   ;;
+  (with-syntax-table (or syntax-ppss-table (syntax-table))
   (let ((old-ppss (cdr syntax-ppss-last))
 	(old-pos (car syntax-ppss-last))
 	(ppss nil)
@@ -567,7 +571,7 @@ running the hook."
        ;; we may end up calling parse-partial-sexp with a position before
        ;; point-min.  In that case, just parse from point-min assuming
        ;; a nil state.
-       (parse-partial-sexp (point-min) pos)))))
+       (parse-partial-sexp (point-min) pos))))))
 
 ;; Debugging functions