DelegatingFilterProxy looks at "registered" WebApplicationContexts #834
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Previously when users registered an additional Filter in the
DispatcherServlet the DelegatingFilterProxy would not find it unless
the context attribute was set. The value for which was difficult to
remember and added quite a bit of additional "if" statements to setting
up Spring Security successfully.
This change allows registering additional known WebApplicationContext
instances. The DispatcherServlet uses this mechanism to register its
context. With that change DelegatingFilterProxy searches for the first
registered WebApplicationContext that contains the bean name.
This change also sets up the ability for Spring Security to lookup
Beans defined in the child context within the Tag libs.
Issue: SPR-13191