Provide custom state in file_and_error_handler
#3408
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The `file_and_error_handler` provided by leptos_axum does not provide the app's custom state in the context. This means that when the fallback handler tries to render the app, the app will not be able to access the custom state (and will panic if it uses `expect_context`). The handle defined by `file_and_error_handler` has access to the custom state from Axum, so we can pass the custom state from Axum into the Leptos handler using the `additional_context` parameter of `handle_response_inner`.
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The
file_and_error_handlerprovided by leptos_axum does not provide the app's custom state in the context. This means that when the fallback handler tries to render the app, the app will not be able to access the custom state (and will panic if it usesexpect_context).The handler defined by
file_and_error_handlerhas access to the custom state from Axum, so we can pass the custom state from Axum into the Leptos handler using theadditional_contextparameter ofhandle_response_inner.I think this might technically be a semver breaking change because we're adding constraints to the
Stype parameter. However, I think it should be fine because any custom state used with this method would need to satisfy these constraints to be used in the first place (e.g., in the LeptosRoutes trait). However, I'll leave it up to you to decide if a version bump is needed, or if there's a way to do this without requiring changing the type constraints.