org-element: Remove :level attribute from plain-list elements

* contrib/lisp/org-element.el (org-element-plain-list-parser):
  Remove :level attribute from plain-list elements since it isn't
  directly related to the plain-list and can be computed during export
  process.
* contrib/lisp/org-e-latex.el (org-e-latex-item): Compute list level.
* contrib/lisp/org-e-html.el (org-e-html-item): Remove unneeded
  reference to :level attribute.
* contrib/lisp/org-e-odt.el (org-e-odt-item): Remove unneeded
  reference to :level attribute.

contrib/lisp/org-e-html.el

@@ -2219,11 +2219,8 @@ contextual information."
   "Transcode an ITEM element from Org to HTML.
 CONTENTS holds the contents of the item.  INFO is a plist holding
 contextual information."
-  ;; Grab `:level' from plain-list properties, which is always the
-  ;; first element above current item.
   (let* ((plain-list (org-export-get-parent item info))
 	 (type (org-element-property :type plain-list))
-	 (level (org-element-property :level plain-list))
 	 (counter (org-element-property :counter item))
 	 (checkbox (org-element-property :checkbox item))
 	 (tag (let ((tag (org-element-property :tag item)))

contrib/lisp/org-e-latex.el

@@ -1347,15 +1347,17 @@ contextual information."
   "Transcode an ITEM element from Org to LaTeX.
 CONTENTS holds the contents of the item.  INFO is a plist holding
 contextual information."
-  ;; Grab `:level' from plain-list properties, which is always the
-  ;; first element above current item.
-  (let* ((level (org-element-property :level (org-export-get-parent item info)))
-	 (counter (let ((count (org-element-property :counter item)))
-		    (and count
-			 (< level 4)
-			 (format "\\setcounter{enum%s}{%s}\n"
-				 (nth level '("i" "ii" "iii" "iv"))
-				 (1- count)))))
+  (let* ((counter
+	  (let ((count (org-element-property :counter item))
+		(level
+		 (loop for parent in (org-export-get-genealogy item info)
+		       count (eq (org-element-type parent) 'plain-list)
+		       until (eq (org-element-type parent) 'headline))))
+	    (and count
+		 (< level 5)
+		 (format "\\setcounter{enum%s}{%s}\n"
+			 (nth (1- level) '("i" "ii" "iii" "iv"))
+			 (1- count)))))
 	 (checkbox (let ((checkbox (org-element-property :checkbox item)))
 		     (cond ((eq checkbox 'on) "$\\boxtimes$ ")
 			   ((eq checkbox 'off) "$\\Box$ ")

contrib/lisp/org-e-odt.el

@@ -3283,11 +3283,8 @@ contextual information."
   "Transcode an ITEM element from Org to HTML.
 CONTENTS holds the contents of the item.  INFO is a plist holding
 contextual information."
-  ;; Grab `:level' from plain-list properties, which is always the
-  ;; first element above current item.
   (let* ((plain-list (org-export-get-parent item info))
 	 (type (org-element-property :type plain-list))
-	 (level (org-element-property :level plain-list))
 	 (counter (org-element-property :counter item))
 	 (checkbox (org-element-property :checkbox item))
 	 (tag (let ((tag (org-element-property :tag item)))

contrib/lisp/org-element.el

@@ -708,8 +708,7 @@ the plain list being parsed.
 
 Return a list whose CAR is `plain-list' and CDR is a plist
 containing `:type', `:begin', `:end', `:contents-begin' and
-`:contents-end', `:level', `:structure' and `:post-blank'
-keywords.
+`:contents-end', `:structure' and `:post-blank' keywords.
 
 Assume point is at the beginning of the list."
   (save-excursion
@@ -723,17 +722,9 @@ Assume point is at the beginning of the list."
 	   (contents-end
 	    (goto-char (org-list-get-list-end (point) struct prevs)))
 	   (end (save-excursion (org-skip-whitespace)
-				(if (eobp) (point) (point-at-bol))))
-	   (level 0))
-      ;; Get list level.
-      (let ((item contents-begin))
-	(while (setq item
-		     (org-list-get-parent
-		      (org-list-get-list-begin item struct prevs)
-		      struct parents))
-	  (incf level)))
+				(if (eobp) (point) (point-at-bol)))))
       ;; Blank lines below list belong to the top-level list only.
-      (when (> level 0)
+      (unless (= (org-list-get-top-point struct) contents-begin)
 	(setq end (min (org-list-get-bottom-point struct)
 		       (progn (org-skip-whitespace)
 			      (if (eobp) (point) (point-at-bol))))))
@@ -744,7 +735,6 @@ Assume point is at the beginning of the list."
 	       :end ,end
 	       :contents-begin ,contents-begin
 	       :contents-end ,contents-end
-	       :level ,level
 	       :structure ,struct
 	       :post-blank ,(count-lines contents-end end)
 	       ,@(cadr keywords))))))