Problem with classNames given to a component in a template (duplicates in DOM)

[fpauser]

See http://jsbin.com/humehu/edit?html,js,output

Expected DOM:
[..] class="ember-view test-comp test-comp-big" [..]

Generated DOM:
[..] class="test-comp-big ember-view test-comp test-comp-big" [..]

[stefanpenner]

can confirm canary also fails: http://jsbin.com/funovotegi/edit?html,js,output

[fpauser]

Added a failing-test: #11609

[stacylondon]

I'm using 1.13.7 and not only am I seeing the class output twice, the 2nd is being output with a space between every letter. Here is a jsbin for reference: http://emberjs.jsbin.com/tiruwo/edit?html,css,js,output. I would also expect the special-class case to include ember-view but it doesn't (additive, not completely replace).

Expected DOM:
[..] class="ember-view default-class special-class [..]

Generated DOM:
[..] class="special-class s p e c i a l - c l a s s [..]

[rwjblue]

This was fixed by #12073 and released in 1.13.8.

[stacylondon]

Thanks! I updated my jsbin to point to 1.13.8 and the issue with spaces in between letters is fixed as well as the class names not being additive. However, "special-class" is still being output twice. http://emberjs.jsbin.com/tiruwo/edit?html,css,js,output

[rwjblue]

I vaguely think that there is another open issue for duplicated classes (but can't search ATM). Can you double check, and open one if you can't find it?

[stacylondon]

Will do, thanks!

[stacylondon]

Didn't see anything that looked related so opened #12146.