org-agenda.el (org-agenda-skip): Correctly handle commented out scheduled/deadline lines

* org-agenda.el (org-agenda-skip): Correctly handle commented
out scheduled/deadline lines.  Refactor.

Thanks to Rainer Stengele for reporting this and to Nick Dokos for
investigating further.  This fix will not slow down the agenda as checking
for a text property seems equally fast (and perhaps even slightly faster)
than checking the character after.

lisp/org-agenda.el

@@ -3728,19 +3728,18 @@ A good way to set it is through options in `org-agenda-custom-commands'.")
 Also moves point to the end of the skipped region, so that search can
 continue from there."
   (let ((p (point-at-bol)) to)
-    (when (org-in-src-block-p t) (throw :skip t))
-    (and org-agenda-skip-archived-trees (not org-agenda-archives-mode)
-	 (get-text-property p :org-archived)
-	 (org-end-of-subtree t)
-	 (throw :skip t))
-    (and org-agenda-skip-comment-trees
-	 (get-text-property p :org-comment)
-	 (org-end-of-subtree t)
-	 (throw :skip t))
-    (if (equal (char-after p) ?#) (throw :skip t))
-    (when (setq to (or (org-agenda-skip-eval org-agenda-skip-function-global)
-		       (org-agenda-skip-eval org-agenda-skip-function)))
-      (goto-char to)
+    (when (or
+	   (eq (get-text-property p 'face) 'font-lock-comment-face)
+	   (and org-agenda-skip-archived-trees (not org-agenda-archives-mode)
+		(get-text-property p :org-archived)
+		(org-end-of-subtree t))
+	   (and org-agenda-skip-comment-trees
+		(get-text-property p :org-comment)
+		(org-end-of-subtree t))
+	   (and (setq to (or (org-agenda-skip-eval org-agenda-skip-function-global)
+			     (org-agenda-skip-eval org-agenda-skip-function)))
+		(goto-char to))
+	   (org-in-src-block-p t))
       (throw :skip t))))
 
 (defun org-agenda-skip-eval (form)