org-element: Allow inlinetasks to be commented and archived

* lisp/org-element.el (org-element-inlinetask-parser): Parse
inlinetasks closer to headings.  In particular, recognize COMMENT
keyword and ARCHIVE tag in inlinetasks on parser level.
* testing/lisp/test-org.el (test-org/comment-dwim): Add tests for
inlinetasks and for uncommenting headings.

Reported-by: Alain.Cochard@unistra.fr
Link: https://orgmode.org/list/25508.20192.899342.932809@gargle.gargle.HOWL

lisp/org-element.el

@@ -1365,7 +1365,16 @@ Assume point is at beginning of the inline task."
 	   (priority (and (looking-at "\\[#.\\][ \t]*")
 			  (progn (goto-char (match-end 0))
 				 (aref (match-string 0) 2))))
-	   (title-start (point))
+           (commentedp
+	    (and (let ((case-fold-search nil))
+                   (looking-at org-element-comment-string))
+		 (goto-char (match-end 0))
+                 (when (looking-at-p "\\(?:[ \t]\\|$\\)")
+                   (point))))
+	   (title-start (prog1 (point)
+                          (unless (or todo priority commentedp)
+                            ;; Headline like "* :tag:"
+                            (skip-chars-backward " \t"))))
 	   (tags (when (re-search-forward
 			"[ \t]+\\(:[[:alnum:]_@#%:]+:\\)[ \t]*$"
 			(line-end-position)
@@ -1375,6 +1384,7 @@ Assume point is at beginning of the inline task."
 	   (title-end (point))
 	   (raw-value (org-trim
 		       (buffer-substring-no-properties title-start title-end)))
+           (archivedp (member org-element-archive-tag tags))
 	   (task-end (save-excursion
 		       (end-of-line)
 		       (and (re-search-forward org-element-headline-re limit t)
@@ -1410,7 +1420,9 @@ Assume point is at beginning of the inline task."
 			 :todo-keyword todo
 			 :todo-type todo-type
 			 :post-blank (1- (count-lines (or task-end begin) end))
-			 :post-affiliated begin)
+			 :post-affiliated begin
+                         :archivedp archivedp
+			 :commentedp commentedp)
 		   time-props
 		   standard-props))))
       (org-element-put-property

testing/lisp/test-org.el

@@ -175,6 +175,26 @@
 	  (org-test-with-temp-text "* Test"
 	    (call-interactively #'org-comment-dwim)
 	    (buffer-string))))
+  ;; Uncomment a heading
+  (should
+   (equal "* Test"
+	  (org-test-with-temp-text "* COMMENT Test"
+	    (call-interactively #'org-comment-dwim)
+	    (buffer-string))))
+  ;; Comment an inlinetask
+  (should
+   (equal "*** COMMENT Test"
+          (let ((org-inlinetask-min-level 3))
+	    (org-test-with-temp-text "*** Test"
+	      (call-interactively #'org-comment-dwim)
+	      (buffer-string)))))
+  ;; Uncomment an inlinetask
+  (should
+   (equal "*** Test"
+	  (let ((org-inlinetask-min-level 3))
+	    (org-test-with-temp-text "*** COMMENT Test"
+	      (call-interactively #'org-comment-dwim)
+	      (buffer-string)))))
   ;; In a source block, use appropriate syntax.
   (should
    (equal "  ;; "