Add `ancestors-full' visibility setup to `org-show-context-detail'

* lisp/org.el(org-show-context-detail): Add `ancestors-full' visibility setup.
(org-show-set-visibility): Update accordingly.
* testing/lisp/test-org.el: Add tests.

lisp/org.el

@@ -1199,6 +1199,8 @@ Allowed visibility spans are
   ancestors      show current headline and its direct ancestors; if
                  point is not on headline, also show entry
 
+  ancestors-full show current subtree and its direct ancestors
+
   lineage        show current headline, its direct ancestors and all
                  their children; if point is not on headline, also show
                  entry and first child
@@ -1240,6 +1242,7 @@ more context."
 			   (const minimal)
 			   (const local)
 			   (const ancestors)
+                           (const ancestors-full)
 			   (const lineage)
 			   (const tree)
 			   (const canonical))))))
@@ -6756,9 +6759,9 @@ be shown."
 
 (defun org-show-set-visibility (detail)
   "Set visibility around point according to DETAIL.
-DETAIL is either nil, `minimal', `local', `ancestors', `lineage',
-`tree', `canonical' or t.  See `org-show-context-detail' for more
-information."
+DETAIL is either nil, `minimal', `local', `ancestors',
+`ancestors-full', `lineage', `tree', `canonical' or t.  See
+`org-show-context-detail' for more information."
   ;; Show current heading and possibly its entry, following headline
   ;; or all children.
   (if (and (org-at-heading-p) (not (eq detail 'local)))
@@ -6773,14 +6776,16 @@ information."
       (org-with-limited-levels
        (cl-case detail
 	 ((tree canonical t) (org-show-children))
-	 ((nil minimal ancestors))
+	 ((nil minimal ancestors ancestors-full))
 	 (t (save-excursion
 	      (outline-next-heading)
 	      (org-flag-heading nil)))))))
+  ;; Show whole subtree.
+  (when (eq detail 'ancestors-full) (org-show-subtree))
   ;; Show all siblings.
   (when (eq detail 'lineage) (org-show-siblings))
   ;; Show ancestors, possibly with their children.
-  (when (memq detail '(ancestors lineage tree canonical t))
+  (when (memq detail '(ancestors ancestors-full lineage tree canonical t))
     (save-excursion
       (while (org-up-heading-safe)
 	(org-flag-heading nil)

testing/lisp/test-org.el

@@ -7975,6 +7975,10 @@ CLOCK: [2012-03-29 Thu 10:00]--[2012-03-29 Thu 16:40] =>  6:40"
     (should (equal '(0 7 8 9) (funcall list-visible-lines 'local nil)))
     (should (equal '(0 3 7) (funcall list-visible-lines 'ancestors t)))
     (should (equal '(0 3 7 8) (funcall list-visible-lines 'ancestors nil)))
+    (should (equal '(0 3 7 8 9 10 11)
+                   (funcall list-visible-lines 'ancestors-full t)))
+    (should (equal '(0 3 7 8 9 10 11)
+                   (funcall list-visible-lines 'ancestors-full nil)))
     (should (equal '(0 3 5 7 12) (funcall list-visible-lines 'lineage t)))
     (should (equal '(0 3 5 7 8 9 12) (funcall list-visible-lines 'lineage nil)))
     (should (equal '(0 1 3 5 7 12 13) (funcall list-visible-lines 'tree t)))