WIP: Add support for multiline list items.

Right now this messes with line numbers.

tests/06-lists.org

@@ -51,3 +51,15 @@ Also with markup
 
 - _Key_ :: _Value_
 - /Key/ 2 :: /Value/ 2
+
+* List with multiline elements
+  :PROPERTIES:
+  :ID:       07-list-with-multiline-elements
+  :CREATED:  [2020-01-01 Wed 01:01]
+  :END:
+
+  - This is a list item...
+    that spans multiple lines
+
+  - This is another list item...
+    that has content on multiple lines

tests/test_org.py

@@ -579,6 +579,17 @@ class TestSerde(unittest.TestCase):
         self.assertEqual(lists2[1][1].counter, "2")
         self.assertEqual(lists2[1][1].counter_sep, ")")
 
+        hl4 = doc.getTopHeadlines()[3]
+        # ...
+        lists4 = hl4.getLists()
+        print(lists4)
+        self.assertEqual(len(lists4), 1)
+
+        self.assertEqual(lists4[0][0].content, ["This is a list item...", "\n  that spans multiple lines"])
+        self.assertEqual(lists4[0][0].bullet, "-")
+        self.assertEqual(lists4[0][1].content, ["This is another list item...", "\n  that has content on multiple lines"])
+        self.assertEqual(lists4[0][1].bullet, "-")
+
     def test_org_roam_07(self):
         with open(os.path.join(DIR, "07-org-roam-v2.org")) as f:
             orig = f.read()