org-agenda: TODO keywords are case sensitive in stuck projects

* lisp/org-agenda.el (org-agenda-list-stuck-projects): Search for
  stuck projects is case sensitive since TODO keywords are.

Reported-by: Guy Mayraz <guy.mayraz@unimelb.edu.au>
<http://permalink.gmane.org/gmane.emacs.orgmode/111529>

lisp/org-agenda.el

@@ -5089,45 +5089,43 @@ Stuck projects are project that have no next actions.  For the definitions
 of what a project is and how to check if it stuck, customize the variable
 `org-stuck-projects'."
   (interactive)
-  (let* ((org-agenda-skip-function
-	  'org-agenda-skip-entry-when-regexp-matches-in-subtree)
-	 ;; We could have used org-agenda-skip-if here.
-	 (org-agenda-overriding-header
+  (let* ((org-agenda-overriding-header
 	  (or org-agenda-overriding-header "List of stuck projects: "))
 	 (matcher (nth 0 org-stuck-projects))
 	 (todo (nth 1 org-stuck-projects))
-	 (todo-wds (if (member "*" todo)
-		       (progn
-			 (org-agenda-prepare-buffers (org-agenda-files
-						      nil 'ifmode))
-			 (org-delete-all
-			  org-done-keywords-for-agenda
-			  (copy-sequence org-todo-keywords-for-agenda)))
-		     todo))
-	 (todo-re (concat "^\\*+[ \t]+\\("
-			  (mapconcat 'identity todo-wds "\\|")
-			  "\\)\\>"))
 	 (tags (nth 2 org-stuck-projects))
-	 (tags-re (if (member "*" tags)
-		      (concat org-outline-regexp-bol
-			      ".*:[[:alnum:]_@#%]+:[ \t]*$")
-		    (if tags
-			(concat org-outline-regexp-bol
-				".*:\\("
-				(mapconcat #'identity tags "\\|")
-				"\\):[[:alnum:]_@#%:]*[ \t]*$"))))
-	 (gen-re (nth 3 org-stuck-projects))
-	 (re-list
-	  (delq nil
-		(list
-		 (if todo todo-re)
-		 (if tags tags-re)
-		 (and gen-re (stringp gen-re) (string-match "\\S-" gen-re)
-		      gen-re)))))
-    (setq org-agenda-skip-regexp
-	  (if re-list
-	      (mapconcat 'identity re-list "\\|")
-	    (error "No information how to identify unstuck projects")))
+	 (gen-re (org-string-nw-p (nth 3 org-stuck-projects)))
+	 (todo-wds
+	  (if (not (member "*" todo)) todo
+	    (org-agenda-prepare-buffers (org-agenda-files nil 'ifmode))
+	    (org-delete-all org-done-keywords-for-agenda
+			    (copy-sequence org-todo-keywords-for-agenda))))
+	 (todo-re (and todo
+		       (format "^\\*+[ \t]+\\(%s\\)\\>"
+			       (mapconcat #'identity todo-wds "\\|"))))
+	 (tags-re (cond ((null tags) nil)
+			((member "*" tags)
+			 (eval-when-compile
+			   (concat org-outline-regexp-bol
+				   ".*:[[:alnum:]_@#%]+:[ \t]*$")))
+			(tags (concat org-outline-regexp-bol
+				      ".*:\\("
+				      (mapconcat #'identity tags "\\|")
+				      "\\):[[:alnum:]_@#%:]*[ \t]*$"))
+			(t nil)))
+	 (re-list (delq nil (list todo-re tags-re gen-re)))
+	 (skip-re
+	  (if (null re-list)
+	      (error "Missing information to identify unstuck projects")
+	    (mapconcat #'identity re-list "\\|")))
+	 (org-agenda-skip-function
+	  ;; Skip entry if `org-agenda-skip-regexp' matches anywhere
+	  ;; in the subtree.
+	  `(lambda ()
+	     (and (save-excursion
+		    (let ((case-fold-search nil))
+		      (re-search-forward ,skip-re (org-end-of-subtree t) t)))
+		  (progn (outline-next-heading) (point))))))
     (org-tags-view nil matcher)
     (setq org-agenda-buffer-name (buffer-name))
     (with-current-buffer org-agenda-buffer-name