org.el (org-fill-paragraph): Fill using `org-mode-transpose-word-syntax-table'

* org.el (org-fill-paragraph): Fill using
`org-mode-transpose-word-syntax-table'.

Thanks to Samuel Wales for raising this issue.

lisp/org.el

@@ -21754,94 +21754,95 @@ a footnote definition, try to fill the first paragraph within."
 	    (paragraph-separate
 	     (cadadr (assoc 'paragraph-separate org-fb-vars))))
 	(fill-paragraph nil))
-    (save-excursion
-      ;; Move to end of line in order to get the first paragraph
-      ;; within a plain list or a footnote definition.
-      (end-of-line)
-      (let ((element (org-element-at-point)))
-	;; First check if point is in a blank line at the beginning of
-	;; the buffer.  In that case, ignore filling.
-	(if (< (point) (org-element-property :begin element)) t
-	  (case (org-element-type element)
-	    ;; Use major mode filling function is src blocks.
-	    (src-block (org-babel-do-key-sequence-in-edit-buffer (kbd "M-q")))
-	    ;; Align Org tables, leave table.el tables as-is.
-	    (table-row (org-table-align) t)
-	    (table
-	     (when (eq (org-element-property :type element) 'org)
-	       (org-table-align))
-	     t)
-	    (paragraph
-	     ;; Paragraphs may contain `line-break' type objects.
-	     (let ((beg (max (point-min)
-			     (org-element-property :contents-begin element)))
-		   (end (min (point-max)
-			     (org-element-property :contents-end element))))
-	       ;; Do nothing if point is at an affiliated keyword.
-	       (if (< (point) beg) t
-		 (when (derived-mode-p 'message-mode)
-		   ;; In `message-mode', do not fill following
-		   ;; citation in current paragraph nor text before
-		   ;; message body.
-		   (let ((body-start (save-excursion (message-goto-body))))
-		     (when body-start (setq beg (max body-start beg))))
-		   (when (save-excursion
-			   (re-search-forward
-			    (concat "^" message-cite-prefix-regexp) end t))
-		     (setq end (match-beginning 0))))
-		 ;; Fill paragraph, taking line breaks into
-		 ;; consideration.  For that, slice the paragraph
-		 ;; using line breaks as separators, and fill the
-		 ;; parts in reverse order to avoid messing with
-		 ;; markers.
-		 (save-excursion
-		   (goto-char end)
-		   (mapc
-		    (lambda (pos)
-		      (fill-region-as-paragraph pos (point) justify)
-		      (goto-char pos))
-		    ;; Find the list of ending positions for line
-		    ;; breaks in the current paragraph.  Add paragraph
-		    ;; beginning to include first slice.
-		    (nreverse
-		     (cons
-		      beg
-		      (org-element-map
-		       (org-element--parse-objects
-			beg end nil org-element-all-objects)
-		       'line-break
-		       (lambda (lb) (org-element-property :end lb)))))))
-		 t)))
-	    ;; Contents of `comment-block' type elements should be
-	    ;; filled as plain text, but only if point is within block
-	    ;; markers.
-	    (comment-block
-	     (let* ((case-fold-search t)
-		    (beg (save-excursion
-			   (goto-char (org-element-property :begin element))
-			   (re-search-forward "^[ \t]*#\\+begin_comment" nil t)
-			   (forward-line)
-			   (point)))
-		    (end (save-excursion
-			   (goto-char (org-element-property :end element))
-			   (re-search-backward "^[ \t]*#\\+end_comment" nil t)
-			   (line-beginning-position))))
-	       (when (and (>= (point) beg) (< (point) end))
-		 (fill-region-as-paragraph
-		  (save-excursion
-		    (end-of-line)
-		    (re-search-backward "^[ \t]*$" beg 'move)
-		    (line-beginning-position))
-		  (save-excursion
-		    (beginning-of-line)
-		    (re-search-forward "^[ \t]*$" end 'move)
-		    (line-beginning-position))
-		  justify)))
-	     t)
-	    ;; Fill comments.
-	    (comment (fill-comment-paragraph justify))
-	    ;; Ignore every other element.
-	    (otherwise t)))))))
+    (with-syntax-table org-mode-transpose-word-syntax-table
+      (save-excursion
+	;; Move to end of line in order to get the first paragraph
+	;; within a plain list or a footnote definition.
+	(end-of-line)
+	(let ((element (org-element-at-point)))
+	  ;; First check if point is in a blank line at the beginning of
+	  ;; the buffer.  In that case, ignore filling.
+	  (if (< (point) (org-element-property :begin element)) t
+	    (case (org-element-type element)
+	      ;; Use major mode filling function is src blocks.
+	      (src-block (org-babel-do-key-sequence-in-edit-buffer (kbd "M-q")))
+	      ;; Align Org tables, leave table.el tables as-is.
+	      (table-row (org-table-align) t)
+	      (table
+	       (when (eq (org-element-property :type element) 'org)
+		 (org-table-align))
+	       t)
+	      (paragraph
+	       ;; Paragraphs may contain `line-break' type objects.
+	       (let ((beg (max (point-min)
+			       (org-element-property :contents-begin element)))
+		     (end (min (point-max)
+			       (org-element-property :contents-end element))))
+		 ;; Do nothing if point is at an affiliated keyword.
+		 (if (< (point) beg) t
+		   (when (derived-mode-p 'message-mode)
+		     ;; In `message-mode', do not fill following
+		     ;; citation in current paragraph nor text before
+		     ;; message body.
+		     (let ((body-start (save-excursion (message-goto-body))))
+		       (when body-start (setq beg (max body-start beg))))
+		     (when (save-excursion
+			     (re-search-forward
+			      (concat "^" message-cite-prefix-regexp) end t))
+		       (setq end (match-beginning 0))))
+		   ;; Fill paragraph, taking line breaks into
+		   ;; consideration.  For that, slice the paragraph
+		   ;; using line breaks as separators, and fill the
+		   ;; parts in reverse order to avoid messing with
+		   ;; markers.
+		   (save-excursion
+		     (goto-char end)
+		     (mapc
+		      (lambda (pos)
+			(fill-region-as-paragraph pos (point) justify)
+			(goto-char pos))
+		      ;; Find the list of ending positions for line
+		      ;; breaks in the current paragraph.  Add paragraph
+		      ;; beginning to include first slice.
+		      (nreverse
+		       (cons
+			beg
+			(org-element-map
+			    (org-element--parse-objects
+			     beg end nil org-element-all-objects)
+			    'line-break
+			  (lambda (lb) (org-element-property :end lb)))))))
+		   t)))
+	      ;; Contents of `comment-block' type elements should be
+	      ;; filled as plain text, but only if point is within block
+	      ;; markers.
+	      (comment-block
+	       (let* ((case-fold-search t)
+		      (beg (save-excursion
+			     (goto-char (org-element-property :begin element))
+			     (re-search-forward "^[ \t]*#\\+begin_comment" nil t)
+			     (forward-line)
+			     (point)))
+		      (end (save-excursion
+			     (goto-char (org-element-property :end element))
+			     (re-search-backward "^[ \t]*#\\+end_comment" nil t)
+			     (line-beginning-position))))
+		 (when (and (>= (point) beg) (< (point) end))
+		   (fill-region-as-paragraph
+		    (save-excursion
+		      (end-of-line)
+		      (re-search-backward "^[ \t]*$" beg 'move)
+		      (line-beginning-position))
+		    (save-excursion
+		      (beginning-of-line)
+		      (re-search-forward "^[ \t]*$" end 'move)
+		      (line-beginning-position))
+		    justify)))
+	       t)
+	      ;; Fill comments.
+	      (comment (fill-comment-paragraph justify))
+	      ;; Ignore every other element.
+	      (otherwise t))))))))
 
 (defun org-auto-fill-function ()
   "Auto-fill function."