Remove left over references to QUOTE blocks

* lisp/org.el (org-quote-string): Remove variable.
(org-enable-fixed-width-editor, org-context): Update docstring.
(org-toggle-fixed-width-section): Remove function and binding.
(org-set-font-lock-defaults): Remove reference to `org-quote-string'.

* lisp/org-element.el (org-element-headline-parser,
  org-element-headline-interpreter): Remove references to
  `org-quote-string'.

* testing/lisp/test-org-element.el (test-org-element/headline-quote-keyword):
  Remove test.
(test-org-element/headline-interpreter): Remove a test.

lisp/org-element.el

@@ -796,8 +796,8 @@ Return a list whose CAR is `headline' and CDR is a plist
 containing `:raw-value', `:title', `:alt-title', `:begin',
 `:end', `:pre-blank', `:contents-begin' and `:contents-end',
 `:level', `:priority', `:tags', `:todo-keyword',`:todo-type',
-`:scheduled', `:deadline', `:closed', `:quotedp', `:archivedp',
-`:commentedp' and `:footnote-section-p' keywords.
+`:scheduled', `:deadline', `:closed', `:archivedp', `:commentedp'
+and `:footnote-section-p' keywords.
 
 The plist also contains any property set in the property drawer,
 with its name in upper cases and colons added at the
@@ -816,10 +816,6 @@ Assume point is at beginning of the headline."
 	   (tags (let ((raw-tags (nth 5 components)))
 		   (and raw-tags (org-split-string raw-tags ":"))))
 	   (raw-value (or (nth 4 components) ""))
-	   (quotedp
-	    (let ((case-fold-search nil))
-	      (string-match (format "^%s\\( \\|$\\)" org-quote-string)
-			    raw-value)))
 	   (commentedp
 	    (let ((case-fold-search nil))
 	      (string-match (format "^%s\\( \\|$\\)" org-comment-string)
@@ -870,13 +866,11 @@ Assume point is at beginning of the headline."
 				     (forward-line)
 				     (point)))))
       ;; Clean RAW-VALUE from any quote or comment string.
-      (when (or quotedp commentedp)
+      (when commentedp
 	(let ((case-fold-search nil))
 	  (setq raw-value
 		(replace-regexp-in-string
-		 (concat
-		  (regexp-opt (list org-quote-string org-comment-string))
-		  "\\(?: \\|$\\)")
+		 (concat (regexp-quote org-comment-string) "\\(?: \\|$\\)")
 		 ""
 		 raw-value))))
       ;; Clean TAGS from archive tag, if any.
@@ -905,8 +899,7 @@ Assume point is at beginning of the headline."
 				       end)
 			  :footnote-section-p footnote-section-p
 			  :archivedp archivedp
-			  :commentedp commentedp
-			  :quotedp quotedp)
+			  :commentedp commentedp)
 		    time-props
 		    standard-props))))
 	(let ((alt-title (org-element-property :ALT_TITLE headline)))
@@ -937,11 +930,9 @@ CONTENTS is the contents of the element."
 		 (and tag-list
 		      (format ":%s:" (mapconcat 'identity tag-list ":")))))
 	 (commentedp (org-element-property :commentedp headline))
-	 (quotedp (org-element-property :quotedp headline))
 	 (pre-blank (or (org-element-property :pre-blank headline) 0))
 	 (heading (concat (make-string (org-reduced-level level) ?*)
 			  (and todo (concat " " todo))
-			  (and quotedp (concat " " org-quote-string))
 			  (and commentedp (concat " " org-comment-string))
 			  (and priority
 			       (format " [#%s]" (char-to-string priority)))

lisp/org.el

@@ -429,12 +429,6 @@ not contribute to the agenda listings.")
 An entry can be toggled between COMMENT and normal with
 \\[org-toggle-comment].")
 
-(defconst org-quote-string "QUOTE"
-  "Entries starting with this keyword will be exported in fixed-width font.
-Quoting applies only to the text in the entry following the headline, and does
-not extend beyond the next headline, even if that is lower level.
-An entry can be toggled between QUOTE and normal with
-\\[org-toggle-fixed-width-section].")
 
 ;;;; LaTeX Environments and Fragments
 
@@ -1554,8 +1548,7 @@ the list structure."
 (defcustom org-enable-fixed-width-editor t
   "Non-nil means lines starting with \":\" are treated as fixed-width.
 This currently only means they are never auto-wrapped.
-When nil, such lines will be treated like ordinary lines.
-See also the QUOTE keyword."
+When nil, such lines will be treated like ordinary lines."
   :group 'org-edit-structure
   :type 'boolean)
 
@@ -6324,9 +6317,7 @@ needs to be inserted at a specific position in the font-lock sequence.")
 	   '(org-activate-code (1 'org-code t))
 	   ;; COMMENT
 	   (list (format org-heading-keyword-regexp-format
-			 (concat "\\("
-				 org-comment-string "\\|" org-quote-string
-				 "\\)"))
+			 (concat "\\(" org-comment-string "\\)"))
 		 '(2 'org-special-keyword t))
 	   ;; Blocks and meta lines
 	   '(org-fontify-meta-lines-and-blocks))))
@@ -19271,7 +19262,6 @@ boundaries."
 (org-defkey org-mode-map "\C-c}"    'org-table-toggle-coordinate-overlays)
 (org-defkey org-mode-map "\C-c{"    'org-table-toggle-formula-debugger)
 (org-defkey org-mode-map "\C-c\C-e" 'org-export-dispatch)
-(org-defkey org-mode-map "\C-c:"    'org-toggle-fixed-width-section)
 (org-defkey org-mode-map "\C-c\C-x\C-f" 'org-emphasize)
 (org-defkey org-mode-map "\C-c\C-xf"    'org-footnote-action)
 (org-defkey org-mode-map "\C-c\C-x\C-mg"    'org-mobile-pull)
@@ -21664,7 +21654,7 @@ contexts are:
 :clocktable       in a clocktable
 :src-block        in a source block
 :link             on a hyperlink
-:keyword          on a keyword: SCHEDULED, DEADLINE, CLOSE, COMMENT, QUOTE.
+:keyword          on a keyword: SCHEDULED, DEADLINE, CLOSE, COMMENT.
 :target           on a <<target>>
 :radio-target     on a <<<radio-target>>>
 :latex-fragment   on a LaTeX fragment
@@ -22827,54 +22817,6 @@ range.  Otherwise, translate both parts."
 
 ;;; Other stuff.
 
-(defun org-toggle-fixed-width-section (arg)
-  "Toggle the fixed-width export.
-If there is no active region, the QUOTE keyword at the current headline is
-inserted or removed.  When present, it causes the text between this headline
-and the next to be exported as fixed-width text, and unmodified.
-If there is an active region, this command adds or removes a colon as the
-first character of this line.  If the first character of a line is a colon,
-this line is also exported in fixed-width font."
-  (interactive "P")
-  (let* ((cc 0)
-	 (regionp (org-region-active-p))
-	 (beg (if regionp (region-beginning) (point)))
-	 (end (if regionp (region-end)))
-	 (nlines (or arg (if (and beg end) (count-lines beg end) 1)))
-	 (case-fold-search nil)
-	 (re "[ \t]*\\(:\\(?: \\|$\\)\\)")
-	 off)
-    (if regionp
-	(save-excursion
-	  (goto-char beg)
-	  (setq cc (current-column))
-	  (beginning-of-line 1)
-	  (setq off (looking-at re))
-	  (while (> nlines 0)
-	    (setq nlines (1- nlines))
-	    (beginning-of-line 1)
-	    (cond
-	     (arg
-	      (org-move-to-column cc t)
-	      (insert ": \n")
-	      (forward-line -1))
-	     ((and off (looking-at re))
-	      (replace-match "" t t nil 1))
-	     ((not off) (org-move-to-column cc t) (insert ": ")))
-	    (forward-line 1)))
-      (save-excursion
-	(org-back-to-heading)
-	(cond
-	 ((looking-at (format org-heading-keyword-regexp-format
-			      org-quote-string))
-	  (goto-char (match-end 1))
-	  (looking-at (concat " +" org-quote-string))
-	  (replace-match "" t t)
-	  (when (eolp) (insert " ")))
-	 ((looking-at org-outline-regexp)
-	  (goto-char (match-end 0))
-	  (insert org-quote-string " ")))))))
-
 (defun org-reftex-citation ()
   "Use reftex-citation to insert a citation into the buffer.
 This looks for a line like

testing/lisp/test-org-element.el

@@ -934,40 +934,6 @@ Some other text
 
 ;;;; Headline
 
-(ert-deftest test-org-element/headline-quote-keyword ()
-  "Test QUOTE keyword recognition."
-  ;; Reference test.
-  (org-test-with-temp-text "* Headline"
-    (let ((org-quote-string "QUOTE"))
-      (should-not (org-element-property :quotedp (org-element-at-point)))))
-  ;; Standard position.
-  (org-test-with-temp-text "* QUOTE Headline"
-    (let* ((org-quote-string "QUOTE")
-	   (headline (org-element-at-point)))
-      (should (org-element-property :quotedp headline))
-      ;; Test removal from raw value.
-      (should (equal (org-element-property :raw-value headline) "Headline"))))
-  ;; Case sensitivity.
-  (org-test-with-temp-text "* QUOTE Headline"
-    (let* ((org-quote-string "Quote")
-	   (headline (org-element-at-point)))
-      (should-not (org-element-property :quotedp headline))
-      (should (equal (org-element-property :raw-value headline)
-		     "QUOTE Headline"))))
-  ;; With another keyword.
-  (org-test-with-temp-text "* TODO QUOTE Headline"
-    (let* ((org-quote-string "QUOTE")
-	   (org-todo-keywords '((sequence "TODO" "DONE")))
-	   (headline (org-element-at-point)))
-      (should (org-element-property :quotedp headline))
-      (should (equal (org-element-property :raw-value headline) "Headline"))))
-  ;; With the keyword only.
-  (org-test-with-temp-text "* QUOTE"
-    (let* ((org-quote-string "QUOTE")
-	   (headline (org-element-at-point)))
-      (should (org-element-property :quotedp headline))
-      (should (equal (org-element-property :raw-value headline) "")))))
-
 (ert-deftest test-org-element/headline-comment-keyword ()
   "Test COMMENT keyword recognition."
   ;; Reference test.
@@ -2199,12 +2165,7 @@ Outside list"
    (equal (let ((org-comment-string "COMMENT"))
 	    (org-test-parse-and-interpret "* COMMENT Headline"))
 	  "* COMMENT Headline\n"))
-  ;; 6. With quote section.
-  (should
-   (equal (let ((org-quote-string "QUOTE"))
-	    (org-test-parse-and-interpret "* QUOTE Headline"))
-	  "* QUOTE Headline\n"))
-  ;; 7. Keep same number of blank lines before body.
+  ;; 6. Keep same number of blank lines before body.
   (should
    (equal (org-test-parse-and-interpret
 	   "* Headline\n\n\nText after two blank lines.")