Dom-bind not working if parent is already attached

[Sleeckx]

Hello,

please consider the following test case. Clicking "Add dom-bind directly" for the first time, it will append the dom-bind template but not its bound children. Upon clicking it again, it adds the bound content as intended.

http://jsbin.com/weyobaqewo/6/edit?html,output

[kevinpschaaf]

Root caused to distribution reentrancy during attached. Short-term solution is for dom-bind to address this specifically; @sorvell to open general issue to cover the reentrancy problem.