37bc5ef4d8
The orderBy filter now allows string predicates passed to the orderBy filter to make use property
name predicates containing non-ident strings, such as spaces or percent signs, or non-latin
characters.
This behaviour requires the predicate string to be double-quoted.
In markup, this might look like so:
```html
<div ng-repeat="item in items | orderBy:'\"Tip %\"'">
...
</div>
```
Or in JS:
```js
var sorted = $filter('orderBy')(array, ['"Tip %"', '-"Subtotal $"'], false);
```
Closes #6143
Closes #6144
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