ob-core: Fix :results list when result is a table

* lisp/ob-core.el (org-babel-insert-result): Do not treat table lines
in RESULT verbatim.
* testing/lisp/test-ob-shell.el (ob-shell/results-list): Add new test.

Reported-by: Rudolf Adamkovič <salutis@me.com>
Link: https://orgmode.org/list/m2tu1v8gj8.fsf@me.com

lisp/ob-core.el

@@ -2464,7 +2464,11 @@ INFO may provide the values of these header arguments (in the
 		       (cons 'unordered
 			     (mapcar
 			      (lambda (e)
-				(list (if (stringp e) e (format "%S" e))))
+                                (cond
+                                 ((stringp e) (list e))
+                                 ((listp e)
+                                  (mapcar (lambda (x) (format "%S" x)) e))
+                                 (t (list (format "%S" e)))))
 			      (if (listp result) result
 				(split-string result "\n" t))))
 		       '(:splicep nil :istart "- " :iend "\n")))

testing/lisp/test-ob-shell.el

@@ -170,6 +170,20 @@ ob-comint.el, which was not previously tested."
 	      "#+BEGIN_SRC sh :results table\necho 'I \"want\" it all'\n#+END_SRC"
 	    (org-babel-execute-src-block)))))
 
+(ert-deftest ob-shell/results-list ()
+  "Test :results list."
+  (org-test-with-temp-text
+      "#+BEGIN_SRC sh :results list\necho 1\necho 2\necho 3\n#+END_SRC"
+    (should
+     (equal '((1) (2) (3))
+            (org-babel-execute-src-block)))
+    (search-forward "#+results")
+    (beginning-of-line 2)
+    (should
+     (equal
+      "- 1\n- 2\n- 3\n"
+      (buffer-substring-no-properties (point) (point-max))))))
+
 ;;; Standard output
 
 (ert-deftest ob-shell/standard-output-after-success ()