Fix truncating pasted nested list

Fixes slab#421

src/core/normalizer.coffee

@@ -39,6 +39,8 @@ class Normalizer
   normalizeLine: (lineNode) ->
     lineNode = Normalizer.wrapInline(lineNode)
     lineNode = Normalizer.handleBreaks(lineNode)
+    if lineNode.tagName == 'LI'
+      Normalizer.flattenList(lineNode)
     lineNode = Normalizer.pullBlocks(lineNode)
     lineNode = this.normalizeNode(lineNode)
     Normalizer.unwrapText(lineNode)
@@ -127,6 +129,18 @@ class Normalizer
       curNode = curNode.nextSibling
     return lineNode
 
+  @flattenList: (listNode) ->
+    ref = listNode.nextSibling
+    innerItems = _.map(listNode.querySelectorAll('li'))
+    innerItems.forEach((item) ->
+      listNode.parentNode.insertBefore(item, ref)
+      ref = item.nextSibling
+    )
+    innerLists = _.map(listNode.querySelectorAll(Object.keys(dom.LIST_TAGS).join(',')))
+    innerLists.forEach((list) ->
+      dom(list).remove()
+    )
+
   @stripComments: (html) ->
     return html.replace(/<!--[\s\S]*?-->/g, '')
 

test/unit/core/document.coffee

@@ -31,6 +31,12 @@ describe('Document', ->
       'list':
         initial:  '<div><ul><li>line</li></ul></div>'
         expected: '<ul><li>line</li></ul>'
+      'nested divs':
+        initial:  '<div><div>One<div><div>Alpha<div><div>I</div></div></div></div></div></div>'
+        expected: '<div>One</div><div>Alpha</div><div>I</div>'
+      'nested list':
+        initial:  '<ul><li>One<ul><li>Alpha<ul><li>I</li></ul></li></ul></li></ul>'
+        expected: '<ul><li>One</li><li>Alpha</li><li>I</li></ul>'
 
     _.each(tests, (test, name) ->
       it(name, ->

test/unit/core/normalizer.coffee

@@ -139,7 +139,13 @@ describe('Normalizer', ->
         initial:  '<div></div>'
         expected: '<div></div>'
       'After block':
-        initial:  '<div>One<div>Two</div>'
+        initial:  '<div>One<div>Two</div></div>'
+        expected: '<div>One</div><div>Two</div>'
+      'Before inner block':
+        initial:  '<div><div>One<div>Two</div></div></div>'
+        expected: '<div>One</div><div>Two</div>'
+      'After inner block':
+        initial:  '<div><div><div>One</div>Two</div></div>'
         expected: '<div>One</div><div>Two</div>'
       'Middle block':
         initial:  '<div>One<div>Two</div>Three</div>'