Hybrid usage of dom-bind stamps content in different places in 1.x and 2.x.

[bicknellr]

In hybrid code, dom-bind (and others) have to be written as a combination of both wrapper and is= form:

<dom-bind>
  <template is="dom-bind">
    <some-element></some-element>
  </template>
</dom-bind>

In 1.x, the content ends up stamped like this:

<dom-bind>
  <some-element></some-element> <!-- content stamped here -->
  <template is="dom-bind">
    <some-element></some-element>
  </template>
</dom-bind>

But in 2.x, the content is stamped like this:

<some-element></some-element> <!-- content stamped here -->
<dom-bind>
  <template is="dom-bind">
    <some-element></some-element>
  </template>
</dom-bind>

This can be a problem if the content depends on looking at the tree it's inserted in, such as IronFitBehavior.

Expected Results

The content of the dom-bind's template is stamped before the dom-bind element in the 1.x case.

Actual Results

The content of the dom-bind's template is stamped inside the dom-bind element but before the template in the 1.x case.

[kevinpschaaf]

Fixed via #4537. Will be released in v1.9.1