fix(slider): slider emiting changes on slide end when disabled

[llorenspujol]

Currently, the slider is firing a change event on slideEnd when it is disabled. If it is disabled and the value of the slider doesn't change, it shouldn't have to emit any change event.

I have added the test and its corresponding fix for it to pass.

[mmalerba]

I don't think this is quite right, how about: this._valueOnSlideStart != this.value && !this.disabled

[llorenspujol]

Yes, maybe is better, I am not in context at all. I will make the change (Y)

[llorenspujol]

I have made the change @mmalerba

[andrewseguin]

Got a minor lint error:

ERROR: /home/travis/build/angular/material2/src/lib/slider/slider.spec.ts[257, 1]: trailing whitespace

[jelbourn]

This passes google presubmit

@llorenspujol we can merge this if you correct the lint error

[llorenspujol]

@jelbourn @andrewseguin lint fixed.

[angular-automatic-lock-bot]

This issue has been automatically locked due to inactivity.
Please file a new issue if you are encountering a similar or related problem.

Read more about our automatic conversation locking policy.

_{This action has been performed automatically by a bot.}