Paper dialog fired a bad event with a paper-dropdown inside

[florent1933]

Description

If a paper-dropdown is inside a paper-dialog with an event iron-overlay-closed, this event is fired when we are closing the paper-dropdown.

Expected outcome

Closing the paper dropdown should not fire the event.

Live Demo

https://jsbin.com/vugijahohi/edit?html,js,console,output

Steps to reproduce

1. Select a value in the paper-dropdown
2. It fires the bad event

Browsers Affected

• Chrome
• Firefox

I don't know for others

• Safari 9
• Safari 8
• Safari 7
• Edge
• IE 11
• IE 10

Maybe related to : #132

[nzacca]

Related issue occurs for the iron-overlay-opened event when the paper-dropdown-menu is opened. Using the same demo above, replace the iron-overlay-closed event with iron-overlay-opened. Issue presents itself after clicking on the dropdown within the paper-dialog.