Button element on-click event fires when disabled attribute is set. (Polymer)

[DartBot]

This issue was originally filed by Cooltomme@gmail.com

---

What steps will reproduce the problem?

1. Create a new Polymer project from Dart Editor wizard
2. In clickcounter.html change the <button> element to look like this:

<button disabled="disabled" on-click="increment">Click me
  <img src="https://www.dartlang.org/imgs/dart-logo.png">
</button>

1. Start the project, and click on the button.

What is the expected output?
The button should be completely disabled. No on-click event should ever fire no matter where we click on the button.

What do you see instead?
When you click on the Dart logo the on-click event fires and the counter increments - BAD!.
When you click on the "Click me" text, the on-click event does not fire - GOOD!.

What version of the product are you using? On what operating system?
Dart Editor version 0.8.1_r28355
Dart SDK version 0.8.1.2_r28355
Slackware64 14.0

[DartBot]

This comment was originally written by thomas.granv...@gmail.com

---

I'm experiencing the same thing.

[kasperl]

Added Area-Polymer, Triaged labels.

[jmesserly]

good catch! I added a note here:
Polymer/polymer#208

---

Added MovedToGithub label.