Prevent keyboard shortcuts from running when the document's active element is a form element

[antidis]

When using some of the old examples on the demo page, I found that the page would change location if I hit J or K. This was quite annoying, so this is an attempt to fix that problem.

Although live examples have been removed, I think this is worth adding. Snippets may have demos with form inputs, and it would be messed up to have the page changed unexpectedly when typing.

[pzuraq]

I think it would be cleaner to have a checker function that returns true/false rather than calling a callback:

    if(formHasFocus()) {
      this.set('isGoingTo', true);
      later(() => {
        this.set('isGoingTo', false);
      }, 500);
    }

But I'm onboard with the behavior change.

[antidis]

Updated to use a function instead.

[antidis]

The callback method is something I've used a lot, mostly in cases where you may not have the object you're trying to run the function on though.

[dfreeman]

Thanks @antidis!