Promote and demote inline tasks

* lisp/org-inlinetask.el (org-inlinetask-promote,
  org-inlinetask-demote): new functions.

* lisp/org.el (org-metaleft, org-metaright): when point is at an
  inline task, promote or demote it.

lisp/org-inlinetask.el

@@ -252,6 +252,55 @@ This assumes the point is inside an inline task."
     (re-search-backward (org-inlinetask-outline-regexp) nil t)
     (- (match-end 1) (match-beginning 1))))
 
+(defun org-inlinetask-promote ()
+  "Promote the inline task at point.
+If the task has an end part, promote it.  Also, prevents level from
+going below `org-inlinetask-min-level'."
+  (interactive)
+  (if (not (org-inlinetask-in-task-p))
+      (error "Not in an inline task")
+    (save-excursion
+      (let* ((lvl (org-inlinetask-get-task-level))
+	     (next-lvl (org-get-valid-level lvl -1))
+	     (diff (- next-lvl lvl))
+	     (down-task (concat (make-string next-lvl ?*)))
+	     beg)
+	(if (< next-lvl org-inlinetask-min-level)
+	    (error "Cannot promote an inline task at minimum level")
+	  (org-inlinetask-goto-beginning)
+	  (setq beg (point))
+	  (replace-match down-task nil t nil 1)
+	  (org-inlinetask-goto-end)
+	  (if (eobp) (beginning-of-line) (forward-line -1))
+	  (unless (= (point) beg)
+	    (replace-match down-task nil t nil 1)
+	    (when org-adapt-indentation
+	      (goto-char beg)
+	      (org-fixup-indentation diff))))))))
+
+(defun org-inlinetask-demote ()
+  "Demote the inline task at point.
+If the task has an end part, also demote it."
+  (interactive)
+  (if (not (org-inlinetask-in-task-p))
+      (error "Not in an inline task")
+    (save-excursion
+      (let* ((lvl (org-inlinetask-get-task-level))
+	     (next-lvl (org-get-valid-level lvl 1))
+	     (diff (- next-lvl lvl))
+	     (down-task (concat (make-string next-lvl ?*)))
+	     beg)
+	(org-inlinetask-goto-beginning)
+	(setq beg (point))
+	(replace-match down-task nil t nil 1)
+	(org-inlinetask-goto-end)
+	(if (eobp) (beginning-of-line) (forward-line -1))
+	(unless (= (point) beg)
+	  (replace-match down-task nil t nil 1)
+	  (when org-adapt-indentation
+	    (goto-char beg)
+	    (org-fixup-indentation diff)))))))
+
 (defvar org-export-current-backend) ; dynamically bound in org-exp.el
 (defun org-inlinetask-export-handler ()
   "Handle headlines with level larger or equal to `org-inlinetask-min-level'.

lisp/org.el

@@ -17066,13 +17066,17 @@ See the individual commands for more information."
   (cond
    ((run-hook-with-args-until-success 'org-metaleft-hook))
    ((org-at-table-p) (org-call-with-arg 'org-table-move-column 'left))
-   ((or (org-on-heading-p)
-	(and (org-region-active-p)
-	     (save-excursion
-	       (goto-char (region-beginning))
-	       (org-on-heading-p))))
+   ((org-with-limited-levels
+     (or (org-on-heading-p)
+	 (and (org-region-active-p)
+	      (save-excursion
+		(goto-char (region-beginning))
+		(org-on-heading-p)))))
     (when (org-check-for-hidden 'headlines) (org-hidden-tree-error))
     (call-interactively 'org-do-promote))
+   ;; At an inline task.
+   ((org-on-heading-p)
+    (call-interactively 'org-inlinetask-promote))
    ((or (org-at-item-p)
 	(and (org-region-active-p)
 	     (save-excursion
@@ -17091,13 +17095,17 @@ See the individual commands for more information."
   (cond
    ((run-hook-with-args-until-success 'org-metaright-hook))
    ((org-at-table-p) (call-interactively 'org-table-move-column))
-   ((or (org-on-heading-p)
-	(and (org-region-active-p)
-	     (save-excursion
-	       (goto-char (region-beginning))
-	       (org-on-heading-p))))
+   ((org-with-limited-levels
+     (or (org-on-heading-p)
+	 (and (org-region-active-p)
+	      (save-excursion
+		(goto-char (region-beginning))
+		(org-on-heading-p)))))
     (when (org-check-for-hidden 'headlines) (org-hidden-tree-error))
     (call-interactively 'org-do-demote))
+   ;; At an inline task.
+   ((org-on-heading-p)
+    (call-interactively 'org-inlinetask-demote))
    ((or (org-at-item-p)
 	(and (org-region-active-p)
 	     (save-excursion