feat(filterFilter): support filterFilter for object literal collection

[quantizor]

Request Type: feature

How to reproduce: Feed an object literal into an ngRepeat to loop over its properties with a filter in use, as shown here: http://plnkr.co/edit/mMvAgQgILcBVkbT2q4z4?p=preview

Component(s): misc core

Impact: small

Complexity: small

This issue is related to:

Detailed Description:

I switched the primary filterFilter iteration method to one that supports both array and object literal collections and added tests for the object version.

Other Comments:

filterFilter was previously only available to array/array-like collections,
but ngRepeat supports iterating over object literals. This PR enables
filtering functionality over object literal properties.

Fixes #6490

[mary-poppins]

Thanks for the PR! Please check the items below to help us merge this faster. See the contributing docs for more information.

• Uses the issue template (#6695)

If you need to make changes to your pull request, you can update the commit with git commit --amend.
Then, update the pull request with git push -f.

Thanks again for your help!

[quantizor]

This is #6508 on an isolated branch

[MigFerreira]

+1

[gkalpak]

I don't really see why you need this...

[thiago-negri]

+1

[Narretz]

We decided that we will not support object collections for filterFilter. In fact, it will now throw when used with an object. The suggested solution is to convert your objects to arrays; you can use a filter for that, too: https://code.angularjs.org/snapshot/docs/error/filter/notarray