Fixes #2235. Manages logical information in shady distribution more d…

…irectly by capturing it explicitly when needed and not whenever distribution is run.

@@ -223,8 +223,14 @@
       },
 
       _updateInsertionPoints: function(host) {
-        host.shadyRoot._insertionPoints =
+        var i$ = host.shadyRoot._insertionPoints =
           factory(host.shadyRoot).querySelectorAll(CONTENT);
+        // ensure <content>'s and their parents have logical dom info.
+        for (var i=0, c; i < i$.length; i++) {
+          c = i$[i];
+          saveLightChildrenIfNeeded(c);
+          saveLightChildrenIfNeeded(factory(c).parentNode);
+        }
       },
 
       // a node is in a shadyRoot, is a shadyRoot,

@@ -53,11 +53,19 @@
         this.shadyRoot._isShadyRoot = true;
         this.shadyRoot._dirtyRoots = [];
         // capture insertion point list
-        this.shadyRoot._insertionPoints = !this._notes || 
+        var i$ = this.shadyRoot._insertionPoints = !this._notes || 
           this._notes._hasContent ?
           this.shadyRoot.querySelectorAll('content') : [];
-        // save logical tree info for shadyRoot.
+        // save logical tree info
+        // a. for shadyRoot 
+        // b. for insertion points (fallback) 
+        // c. for parents of insertion points
         saveLightChildrenIfNeeded(this.shadyRoot);
+        for (var i=0, c; i < i$.length; i++) {
+          c = i$[i];
+          saveLightChildrenIfNeeded(c);
+          saveLightChildrenIfNeeded(c.parentNode);
+        }
         this.shadyRoot.host = this;
       },
 
@@ -406,9 +414,6 @@
       }
       // remove child from its old parent first
       remove(newChild);
-      // make sure we never lose logical DOM information:
-      // if the parentNode doesn't have lightChildren, save that information now.
-      saveLightChildrenIfNeeded(parentNode);
       // insert it into the real DOM
       nativeInsertBefore.call(parentNode, newChild, refChild || null);
       newChild._composedParent = parentNode;
@@ -417,9 +422,6 @@
     function remove(node) {
       var parentNode = getComposedParent(node);
       if (parentNode) {
-        // make sure we never lose logical DOM information:
-        // if the parentNode doesn't have lightChildren, save that information now.
-        saveLightChildrenIfNeeded(parentNode);
         node._composedParent = null;
         // remove it from the real DOM
         nativeRemoveChild.call(parentNode, node);

@@ -47,6 +47,12 @@
 
 <x-redistribute-a-b></x-redistribute-a-b>
 
+<div id="container">
+  <x-echo></x-echo>
+  <span>1</span>
+  <span>2</span>
+</div>
+
 <script src="polymer-dom.js"></script>
 
 </body>

@@ -47,6 +47,12 @@
 
 <x-redistribute-a-b></x-redistribute-a-b>
 
+<div id="container">
+  <x-echo></x-echo>
+  <span>1</span>
+  <span>2</span>
+</div>
+
 <script src="polymer-dom.js"></script>
 
 </body>

@@ -424,6 +424,34 @@ suite('Polymer.dom', function() {
     assert.equal(Polymer.dom(rere.root).querySelectorAll('span').length, 0);
   });
 
+  test('appendChild interacts with unmanaged parent tree', function() {
+    var container = document.querySelector('#container');
+    var echo = Polymer.dom(container).firstElementChild;
+    assert.equal(echo.localName, 'x-echo');
+    var s1 = Polymer.dom(echo).nextElementSibling;
+    assert.equal(s1.textContent, '1');
+    var s2 = Polymer.dom(s1).nextElementSibling;
+    assert.equal(s2.textContent, '2');
+    assert.equal(Polymer.dom(container).children.length, 3);
+    Polymer.dom(echo).appendChild(s1);
+    Polymer.dom.flush();
+    assert.equal(Polymer.dom(container).children.length, 2);
+    assert.equal(Polymer.dom(echo).nextElementSibling, s2);
+    Polymer.dom(echo).appendChild(s2);
+    Polymer.dom.flush();
+    assert.equal(Polymer.dom(container).children.length, 1);
+    assert.equal(Polymer.dom(echo).nextElementSibling, null);
+    Polymer.dom(container).appendChild(s1);
+    Polymer.dom.flush();
+    assert.equal(Polymer.dom(container).children.length, 2);
+    assert.equal(Polymer.dom(echo).nextElementSibling, s1);
+    Polymer.dom(container).appendChild(s2);
+    Polymer.dom.flush();
+    assert.equal(Polymer.dom(container).children.length, 3);
+    assert.equal(Polymer.dom(echo).nextElementSibling, s1);
+    assert.equal(Polymer.dom(s1).nextElementSibling, s2);
+  });
+
   test('distribute (forced)', function() {
     var rere = Polymer.dom(testElement.root).querySelector('x-rereproject');
     var re = Polymer.dom(rere.root).querySelector('x-reproject');

@@ -473,7 +473,7 @@
 }
 
 function updateRootInsertionPoints(root) {
-  root._insertionPoints = root.querySelectorAll('content');
+  Polymer.dom(root.host)._updateInsertionPoints(root.host);
 }
 
 function getComposedHTML(node) {