UrlEditor doesn't recognize key as segment for collection-valued navigation properties

[mikepizzo]

Steps to repro:

1. go to https://rapid.rocks/api-explorer/index.html
2. type the following in the url editbox:

competitors/cgswl/

3. notice that intellisense doesn't complain about cgswl and gives you properties of a company -- it understands "cgswl" is a key segment
4. continue typing:

competitors/cgswl/employees/1

5. notice that intellisense doesn't give you properties of an employee and complains about "1" not being a property -- it doesn't understand that 1 is a key segment within the collection-valued navigation property.

if you hit "Send Request" at this point you'll see that it is a valid Url.

=>urlEditor seems to recognize key-as-segment as being valid for an entityset, but not for a collection-valued navigation property.