[0.9] when I move a dom-repeat element from one parent to another, the items will gone

[jwu]

<dom-module id="custom-element">
  <template>
    <template is="dom-repeat">{{users}}</div>
  </template>
</dom-module>

In the

<div id="first"><custom-element id="my-list"></custom-element></div>
<div id="second"></div>

When I use Polymer.dom(element("#second")).appendChild( element("#my-list") ), the whole list inside it will be removed.

[jwu]

Well, I check the Polymer latest code and found this issue relative with the code here: https://github.com/Polymer/polymer/blob/0.8-preview/src/lib/template/dom-repeat.html#L199

In the dom-repeat there is a detached callback that will clear all the list item when the dom detached. I think it should add an attached callback to recover the element, otherwise the dom list will gone, but the Polymer element still have that data keep on it.

Q: When will people detached a list and attach it some where again?
A: I have a panel system that can freely dock itself from one parent to another. If there is a dom-repeat list in it, when the panel moving and dock to other place, the items in the dom-repeat will be detached based on the code I found above, but never recover again when the panel dock to other element. But as you see, the panel element still have the list data, so it should be recovered.

[kevinpschaaf]

Yes, dom-repeat needs balanced re-attachment logic to re-insert stamped nodes back into the DOM after having been detached. This will be the fix.