- Prior to this change using asp-page-handler on its own did not create correct `<form>` elements. There were multiple issues, one as that the `FormTagHelper` would purposefully drop into a no-op code path. Second is the `DefaultHtmlGenerator` didn't call through to the `UrlHelper` correctly.
- Added functional test cases to validate asp-page-handler can live on its own on a form tag. This also included adding a variant where method="post".
- Added a `FormTagHelper` unit test to validate the `PageHandler` property is consumed properly.
#6208
The View Engine now needs to know about pages :(. This isn't ideal but the
view engine needs to know what set of search paths to use. This was
already hardcoded for controllers vs controllers + areas. It felt right to
further hardcode instead of introduce a wierd abstraction that we only
use.
Additionally pages use a view location expander to implement an ascending
directory search.
Ryan Nowak
N. Taylor Mullen
Ryan Brandenburg
Pranav K
Hisham Bin Ateya