org-agenda: Fix `org-agenda-skip-if'

* lisp/org-agenda.el (org-agenda-skip-if): Prevent some checks from
  moving point, since this stops following checks from running
  properly.

Reported-by: "cro cefisso" <crocefisso@gmx.com>
<http://lists.gnu.org/archive/html/emacs-orgmode/2017-09/msg00182.html>

lisp/org-agenda.el

@@ -4878,39 +4878,41 @@ keywords.  Possible classes are: `todo', `done', `any'.
 If any of these conditions is met, this function returns the end point of
 the entity, causing the search to continue from there.  This is a function
 that can be put into `org-agenda-skip-function' for the duration of a command."
-  (let (beg end m)
-    (org-back-to-heading t)
-    (setq beg (point)
-	  end (if subtree
-		  (progn (org-end-of-subtree t) (point))
-		(progn (outline-next-heading) (1- (point)))))
-    (goto-char beg)
+  (org-back-to-heading t)
+  (let* ((beg (point))
+	 (end (if subtree (save-excursion (org-end-of-subtree t) (point))
+		(org-entry-end-position)))
+	 (planning-end (if subtree end (line-end-position 2)))
+	 m)
     (and
-     (or
-      (and (memq 'scheduled conditions)
-	   (re-search-forward org-scheduled-time-regexp end t))
-      (and (memq 'notscheduled conditions)
-	   (not (re-search-forward org-scheduled-time-regexp end t)))
-      (and (memq 'deadline conditions)
-	   (re-search-forward org-deadline-time-regexp end t))
-      (and (memq 'notdeadline conditions)
-	   (not (re-search-forward org-deadline-time-regexp end t)))
-      (and (memq 'timestamp conditions)
-	   (re-search-forward org-ts-regexp end t))
-      (and (memq 'nottimestamp conditions)
-	   (not (re-search-forward org-ts-regexp end t)))
-      (and (setq m (memq 'regexp conditions))
-	   (stringp (nth 1 m))
-	   (re-search-forward (nth 1 m) end t))
-      (and (setq m (memq 'notregexp conditions))
-	   (stringp (nth 1 m))
-	   (not (re-search-forward (nth 1 m) end t)))
-      (and (or
-	    (setq m (memq 'nottodo conditions))
-	    (setq m (memq 'todo-unblocked conditions))
-	    (setq m (memq 'nottodo-unblocked conditions))
-	    (setq m (memq 'todo conditions)))
-	   (org-agenda-skip-if-todo m end)))
+     (or (and (memq 'scheduled conditions)
+	      (re-search-forward org-scheduled-time-regexp planning-end t))
+	 (and (memq 'notscheduled conditions)
+	      (not
+	       (save-excursion
+		 (re-search-forward org-scheduled-time-regexp planning-end t))))
+	 (and (memq 'deadline conditions)
+	      (re-search-forward org-deadline-time-regexp planning-end t))
+	 (and (memq 'notdeadline conditions)
+	      (not
+	       (save-excursion
+		 (re-search-forward org-deadline-time-regexp planning-end t))))
+	 (and (memq 'timestamp conditions)
+	      (re-search-forward org-ts-regexp end t))
+	 (and (memq 'nottimestamp conditions)
+	      (not (save-excursion (re-search-forward org-ts-regexp end t))))
+	 (and (setq m (memq 'regexp conditions))
+	      (stringp (nth 1 m))
+	      (re-search-forward (nth 1 m) end t))
+	 (and (setq m (memq 'notregexp conditions))
+	      (stringp (nth 1 m))
+	      (not (save-excursion (re-search-forward (nth 1 m) end t))))
+	 (and (or
+	       (setq m (memq 'nottodo conditions))
+	       (setq m (memq 'todo-unblocked conditions))
+	       (setq m (memq 'nottodo-unblocked conditions))
+	       (setq m (memq 'todo conditions)))
+	      (org-agenda-skip-if-todo m end)))
      end)))
 
 (defun org-agenda-skip-if-todo (args end)