Specifying @model in a page ignores value specified by @inherit from a _ViewImport

[pranavkm]

We have code that prevents @model and @inherits from being specified in the same page. However this check happens at parse time. Consequently specifying an @inherits MyBase<TModel> in _ViewImports and @model CustomModel doesn't produce an error. Instead, the @model wins and resets the base type to the default (RazorPage<>).

This seems like a reasonable thing to do - we shouldn't error on it.

Related: #3143

[danroth27]

Please chat with @Eilon on the approach for this issue.