IE8: No such interface supported in Highlighter

[krusynth]

@tilgovi : I haven't begun to dig into this one yet, but it doesn't look like xpath-range supports IE? Going back to this discussion about xpath-range, what is the path forward here? We're already using Rangy elsewhere for IE8 now, so is that a better basis for a new Highlighter plugin?

For #408

[tilgovi]

We're primarily using rangy as shim support for Range and Selection. It has a highlighter module, but the author states that "TextRange and Highlighter modules are still in active development and as such are more unstable." [1]

I think we should probably glance at what the problem is. We can probably just fix our code quickly.

[tilgovi]

Can you post the actual traceback or error? Maybe open the issue against xpath-range repo.

[krusynth]

So the actual error is "No such interface supported", but since that's coming out of the tests, I'm having trouble getting a traceback (because it's catching it). Digging in more now.

[tilgovi]

Hopefully, we just need to release xpath-range and update the dependency here.