Mark `org-link-escape-browser' as obsolete

* lisp/org-compat.el (org-link-escape-browser): Make function an alias
  for `url-encode-url'.
* lisp/org.el (org-link-escape-chars-browser): Remove variable.
(org-link-escape-browser): Remove function.
(org-open-at-point):
* lisp/ox-html.el (org-html-link): Use `url-encode-url'.
* testing/lisp/test-org.el(test-org/org-link-escape-chars-browser):
  Remove test.

lisp/org-compat.el

@@ -93,6 +93,7 @@
 (define-obsolete-function-alias 'org-char-to-string 'char-to-string "Org 9.0")
 (define-obsolete-function-alias 'org-delete-directory 'delete-directory "Org 9.0")
 (define-obsolete-function-alias 'org-format-seconds 'format-seconds "Org 9.0")
+(define-obsolete-function-alias 'org-link-escape-browser 'url-encode-url "Org 9.0")
 (define-obsolete-function-alias 'org-no-warnings 'with-no-warnings "Org 9.0")
 (define-obsolete-function-alias 'org-number-sequence 'number-sequence "Org 9.0")
 (define-obsolete-function-alias 'org-pop-to-buffer-same-window 'pop-to-buffer-same-window "Org 9.0")

lisp/org.el

@@ -10079,15 +10079,6 @@ according to FMT (default from `org-email-link-description-format')."
   "List of characters that should be escaped in a link when stored to Org.
 This is the list that is used for internal purposes.")
 
-(defconst org-link-escape-chars-browser
-  ;;%20 %22
-  '(?\s ?\")
-  "List of characters to be escaped before handing over to the browser.
-If you consider using this constant then you probably want to use
-the function `org-link-escape-browser' instead.  See there why
-this constant is a candidate to be removed once Org drops support
-for Emacs 24.1 and 24.2.")
-
 (defun org-link-escape (text &optional table merge)
   "Return percent escaped representation of TEXT.
 TEXT is a string with the text to escape.
@@ -10110,29 +10101,6 @@ If optional argument MERGE is set, merge TABLE into
 	 (char-to-string c)))
      text "")))
 
-(defun org-link-escape-browser (text)
-  "Escape some characters before handing over to the browser.
-This function is a candidate to be removed together with the
-constant `org-link-escape-chars-browser' once Org drops support
-for Emacs 24.1 and 24.2.  All calls to this function will have to
-be replaced with `url-encode-url' which is available since Emacs
-24.3.1."
-  ;; Example with the Org link
-  ;; [[http://lists.gnu.org/archive/cgi-bin/namazu.cgi?idxname=emacs-orgmode&query=%252Bsubject:"Release+8.2"]]
-  ;; to open the browser with +subject:"Release 8.2" filled into the
-  ;; query field: In this case the variable TEXT contains the
-  ;; unescaped [...]=%2Bsubject:"Release+8.2".  Then `url-encode-url'
-  ;; converts correctly to [...]=%2Bsubject:%22Release+8.2%22 or
-  ;; `org-link-escape' with `org-link-escape-chars-browser' converts
-  ;; wrongly to [...]=%252Bsubject:%22Release+8.2%22.
-  (if (fboundp 'url-encode-url)
-      (url-encode-url text)
-    (if (org-string-match-p
-	 (concat "[[:nonascii:]" org-link-escape-chars-browser "]")
-	 text)
-	(org-link-escape text org-link-escape-chars-browser)
-      text)))
-
 (defun org-link-unescape (str)
   "Unhex hexified Unicode parts in string STR.
 E.g. `%C3%B6' becomes the german o-Umlaut.  This is the
@@ -10776,10 +10744,9 @@ link in a property drawer line."
 			((boundp f-or-v) (describe-variable f-or-v))
 			(t (error "Not a known function or variable")))))
 	       ((member type '("http" "https" "ftp" "mailto" "news"))
-		(browse-url (org-link-escape-browser (concat type ":" path))))
+		(browse-url (url-encode-url (concat type ":" path))))
 	       ((equal type "doi")
-		(browse-url
-		 (org-link-escape-browser (concat org-doi-server-url path))))
+		(browse-url (url-encode-url (concat org-doi-server-url path))))
 	       ((equal type "message") (browse-url (concat type ":" path)))
 	       ((equal type "shell")
 		(let ((buf (generate-new-buffer "*Org Shell Output*"))

lisp/ox-html.el

@@ -2916,8 +2916,7 @@ INFO is a plist holding contextual information.  See
 	 (path
 	  (cond
 	   ((member type '("http" "https" "ftp" "mailto" "news"))
-	    (org-link-escape-browser
-	     (org-link-unescape (concat type ":" raw-path))))
+	    (url-encode-url (org-link-unescape (concat type ":" raw-path))))
 	   ((string= type "file")
 	    ;; Treat links to ".org" files as ".html", if needed.
 	    (setq raw-path

testing/lisp/test-org.el

@@ -2137,19 +2137,6 @@ http://article.gmane.org/gmane.emacs.orgmode/21459/"
     (org-link-unescape
      (org-link-escape "http://some.host.com/form?&id=blah%2Bblah25")))))
 
-(ert-deftest test-org/org-link-escape-chars-browser ()
-  "Test of the constant `org-link-escape-chars-browser'.
-See there why this test is a candidate to be removed once Org
-drops support for Emacs 24.1 and 24.2."
-  (should
-   (string=
-    (concat "http://lists.gnu.org/archive/cgi-bin/namazu.cgi?query="
-	    "%22Release%208.2%22&idxname=emacs-orgmode")
-    (org-link-escape-browser ; Do not replace with `url-encode-url',
-			     ; see docstring above.
-     (concat "http://lists.gnu.org/archive/cgi-bin/namazu.cgi?query="
-	     "\"Release 8.2\"&idxname=emacs-orgmode")))))
-
 ;;;; Open at point
 
 (ert-deftest test-org/open-at-point-in-keyword ()