Fixed copy/paste of card section following a list section

closes #637
- if a non-markerable section immediately followed a list section the `post.trimTo()` was not appending it to the post
- resetting the `sectionParent` to the `post` object when hitting a non-markerable section allows all sections to be appended to the constrained post

src/js/models/post.js

@@ -222,6 +222,7 @@ class Post {
         );
       } else {
         newSection = section.clone();
+        sectionParent = post;
       }
       if (sectionParent) {
         sectionParent.sections.append(newSection);

tests/acceptance/editor-copy-paste-test.js

@@ -299,6 +299,46 @@ test('copy-paste can copy list sections', (assert) => {
   assert.hasElement($('#editor ul:eq(0) li:contains(list)'));
 });
 
+test('copy-paste can copy card following list section', (assert) => {
+  const mobiledoc = Helpers.mobiledoc.build(
+    ({post, markupSection, marker, listSection, listItem, cardSection}) => {
+      return post([
+        markupSection('p', [marker('abc')]),
+        listSection('ul', [
+          listItem([marker('list')])
+        ]),
+        cardSection('test-card', {foo: 'bar'}),
+        markupSection('p', [marker('123')])
+      ]);
+    });
+  let cards = [{
+    name: 'test-card',
+    type: 'dom',
+    render({ payload }) {
+      return $(`<div class='${payload.foo}'>${payload.foo}</div>`)[0];
+    }
+  }];
+  editor = new Editor({mobiledoc, cards});
+  editor.render(editorElement);
+
+  assert.hasElement('#editor .bar', 'precond - renders card');
+
+  Helpers.dom.selectText(editor, 'c', editor.element, '3', editor.element);
+
+  Helpers.dom.triggerCopyEvent(editor);
+
+  let textNode = $('#editor p')[1].childNodes[0];
+  assert.equal(textNode.textContent, '123', 'precond - correct textNode');
+
+  Helpers.dom.moveCursorTo(editor, textNode, 3); // end of node
+  Helpers.dom.triggerPasteEvent(editor);
+
+  assert.equal($('#editor ul').length, 2, 'pastes the list');
+  assert.hasElement('#editor ul:eq(1) li:contains(list)');
+
+  assert.equal($('#editor .bar').length, 2, 'renders a second card');
+});
+
 test('copy sets html & text for pasting externally', (assert) => {
   const mobiledoc = Helpers.mobiledoc.build(
     ({post, markupSection, marker}) => {