ol: Fix some corner cases when normalizing context in links

* lisp/ol.el (org-link--normalize-string): Handle blanks between
special characters.
(org-link-heading-search-string): Small refactoring.
* testing/lisp/test-ol.el (test-ol/store-link): Add tests.

lisp/ol.el

@@ -745,20 +745,24 @@ This function removes contiguous white spaces and statistics
 cookies.  When optional argument CONTEXT is non-nil, it assumes
 STRING is a context string, and also removes special search
 syntax around the string."
-  (when context
-    (while (cond ((and (string-prefix-p "(" string)
-		       (string-suffix-p ")" string))
-		  (setq string (substring string 1 -1)))
-		 ((string-match "\\`[#*]+" string)
-		  (setq string (substring string (match-end 0))))
-		 (t nil))))
-  (org-trim
-   (replace-regexp-in-string
-    (rx (or (one-or-more (any " \t"))
+  (let ((string
+	 (org-trim
+	  (replace-regexp-in-string
+	   (rx (one-or-more (any " \t")))
+	   " "
+	   (replace-regexp-in-string
 	    ;; Statistics cookie regexp.
-	    (seq "[" (0+ digit) (or "%" (seq "/" (0+ digit))) "]")))
-    " "
-    string)))
+	    (rx (seq "[" (0+ digit) (or "%" (seq "/" (0+ digit))) "]"))
+	    " "
+	    string)))))
+    (when context
+      (while (cond ((and (string-prefix-p "(" string)
+			 (string-suffix-p ")" string))
+		    (setq string (org-trim (substring string 1 -1))))
+		   ((string-match "\\`[#*]+[ \t]*" string)
+		    (setq string (substring string (match-end 0))))
+		   (t nil))))
+    string))
 
 
 ;;; Public API
@@ -1251,14 +1255,11 @@ statistics cookies are removed, and contiguous spaces are packed
 into a single one.
 
 When optional argument STRING is non-nil, assume it a headline,
-without any TODO or COMMENT keyword, and without any priority
-cookie or tag."
-  (org-link--normalize-string
-   (if (not string)
-       (concat "*" (org-trim (org-get-heading t t t t)))
-     (let ((s (org-trim string)))
-       (if (string-prefix-p "*" s) s
-	 (concat "*" s))))))
+without any asterisk, TODO or COMMENT keyword, and without any
+priority cookie or tag."
+  (concat "*"
+	  (org-link--normalize-string
+	   (or string (org-get-heading t t t t)))))
 
 (defun org-link-open-as-file (path arg)
   "Pretend PATH is a file name and open it.

testing/lisp/test-ol.el

@@ -263,7 +263,95 @@
        (fundamental-mode)
        (let ((file (buffer-file-name)))
 	 (equal (format "[[file:%s][file:%s]]" file file)
-		(org-store-link '(16))))))))
+		(org-store-link '(16)))))))
+  ;; Context does not include special search syntax.
+  (should
+   (let ((org-stored-links nil)
+	 (org-context-in-file-links t))
+     (org-test-with-temp-text-in-file "(two)"
+       (fundamental-mode)
+       (let ((file (buffer-file-name)))
+	 (equal (format "[[file:%s::two]]" file file)
+		(org-store-link nil))))))
+  (should
+   (let ((org-stored-links nil)
+	 (org-context-in-file-links t))
+     (org-test-with-temp-text-in-file "# two"
+       (fundamental-mode)
+       (let ((file (buffer-file-name)))
+	 (equal (format "[[file:%s::two]]" file file)
+		(org-store-link nil))))))
+  (should
+   (let ((org-stored-links nil)
+	 (org-context-in-file-links t))
+     (org-test-with-temp-text-in-file "*two"
+       (fundamental-mode)
+       (let ((file (buffer-file-name)))
+	 (equal (format "[[file:%s::two]]" file file)
+		(org-store-link nil))))))
+  (should
+   (let ((org-stored-links nil)
+	 (org-context-in-file-links t))
+     (org-test-with-temp-text-in-file "( two )"
+       (fundamental-mode)
+       (let ((file (buffer-file-name)))
+	 (equal (format "[[file:%s::two]]" file file)
+		(org-store-link nil))))))
+  (should
+   (let ((org-stored-links nil)
+	 (org-context-in-file-links t))
+     (org-test-with-temp-text-in-file "# two"
+       (fundamental-mode)
+       (let ((file (buffer-file-name)))
+	 (equal (format "[[file:%s::two]]" file file)
+		(org-store-link nil))))))
+  (should
+   (let ((org-stored-links nil)
+	 (org-context-in-file-links t))
+     (org-test-with-temp-text-in-file "#( two )"
+       (fundamental-mode)
+       (let ((file (buffer-file-name)))
+	 (equal (format "[[file:%s::two]]" file file)
+		(org-store-link nil))))))
+  (should
+   (let ((org-stored-links nil)
+	 (org-context-in-file-links t))
+     (org-test-with-temp-text-in-file "#** ((## two) )"
+       (fundamental-mode)
+       (let ((file (buffer-file-name)))
+	 (equal (format "[[file:%s::two]]" file file)
+		(org-store-link nil))))))
+  (should-not
+   (let ((org-stored-links nil)
+	 (org-context-in-file-links t))
+     (org-test-with-temp-text-in-file "(two"
+       (fundamental-mode)
+       (let ((file (buffer-file-name)))
+	 (equal (format "[[file:%s::two]]" file file)
+		(org-store-link nil))))))
+  ;; Context also ignore statistics cookies and special headlines
+  ;; data.
+  (should
+   (let ((org-stored-links nil)
+	 (org-context-in-file-links t))
+     (org-test-with-temp-text-in-file "* TODO [#A] COMMENT foo :bar:"
+       (let ((file (buffer-file-name)))
+	 (equal (format "[[file:%s::*foo][foo]]" file file)
+		(org-store-link nil))))))
+  (should
+   (let ((org-stored-links nil)
+	 (org-context-in-file-links t))
+     (org-test-with-temp-text-in-file "* foo[33%]bar"
+       (let ((file (buffer-file-name)))
+	 (equal (format "[[file:%s::*foo bar][foo bar]]" file file)
+		(org-store-link nil))))))
+  (should
+   (let ((org-stored-links nil)
+	 (org-context-in-file-links t))
+     (org-test-with-temp-text-in-file "* [%][/]  foo [35%] bar[3/5]"
+       (let ((file (buffer-file-name)))
+	 (equal (format "[[file:%s::*foo bar][foo bar]]" file file)
+		(org-store-link nil)))))))
 
 
 ;;; Radio Targets