The issue here is actually different than described in the bug.
ResultFilter should only short circuit when .Cancel is set to true. This
is consistent with legacy MVC.
Added tests for all of this stuff. There's already good test coverage for
the invoker, what was missing was coverage for the attributes and for the
methods on Controller. ExceptionFilterAttribute and
AuthorizationFilterAttribute don't have short circuiting logic inside of
them, so they are already covered by tests for the invoker.
- correct file and class names for some HH extensions
- three class names were correct but didn't match containing file
- three class and file names matched but didn't start with HtmlHelper
- clean up trailing whitespace and long lines in changed Extensions.cs files
- `HtmlHelperPartialAsyncExtensions`, `HtmlHelperRenderPartialAsyncExtensions`
and `HtmlHelperValidationExtensions` lacked some `[NotNull]` attributes
- merge extension files by concept
- Display / DisplayFor / DisplayForModel methods all into `HtmlHelperDisplayExtensions`
- Partial / RenderPartial methods all into `HtmlHelperPartialExtensions`
- use `IHtmlHelper<TModel>` everywhere
- Remove runtime interface declarations and use
Microsoft.Net.Runtime.Interfaces package
- Made tests compile for net45 and made default
intellisense view net45 for unit tests since Moq
doesn't work