This change removes the dependency of TempData on the IHttpContextAccessor
by creating an ITempDataDictionaryFactory abstraction. In general, no one
will replace the factory, it's just indirection.
This allows us to drop our dependency on IHttpContextAccessor, and move it
to the functional tests where we specifically depend on it.
The bulk of code churn here is to update tests that use TempData.
- #3307
- relative paths are now supported in `View()` calls from components and view components,
`Html.PartialAsync()` and similar calls, and `RazorPage.Layout` settings.
- support absolute paths, relative paths, and view location lookups consistently / everywhere
- support view paths in `TemplateRenderer` e.g. passing an absolute path to `Html.EditorFor()`
- take a big swing at the `IRazorViewEngine` and `IViewEngine` interfaces
- split lookups (view names) from navigation (view paths)
- remove `Partial` separation; use parameters to set `IsPartial` properties
- correct `ViewContext` copy constructor and add unit test
- extend unit tests to cover relative paths
- fix existing tests to handle newly-required extension in an absolute path
- add functional test that chains relative paths
nits:
- remove some YOLO line wrapping
- `""` -> `string.Empty`