checkbox: clicking links in labels also toggles the value

[nikclayton]

Actual Behavior:

• What is the issue? *
  If an md-checkbox has a text or a label that contains a link, clicking the link (either with _target="blank" to open in a new tab, or Ctrl-click) also toggles the checkbox.
• What is the expected behavior?
  Not toggle the checkbox. This is the behavior of the native <input type="checkbox">.

CodePen (or steps to reproduce the issue): *

• CodePen Demo which shows your issue: https://codepen.io/anon/pen/VzeoJO
• Details: Demo is set up to show the different behaviors. Follow the instructions in the text.

AngularJS Versions: *

• AngularJS Version: 1.6.4
• AngularJS Material Version: 1.1.4

Additional Information:

• Browser Type: * Chrome
• Browser Version: * 59.0.3071.115 (Official Build) (64-bit)
• OS: * Ubuntu 14.04
• Stack Traces: N/A

[Splaktar]

This is related to #11134, which can't be fixed until 1.2.0. I need to investigate whether this can be fixed prior to 1.2.0.