Prior to this commit, if a subclass of
org.springframework.web.servlet.view.AbstractView or
org.springframework.web.reactive.result.view.AbstractUrlBasedView
configured a custom value for the requestContextAttribute, that value
was overwritten with null whenever the View was dynamically
instantiated by a UrlBasedViewResolver, and this could lead to
confusing behavior for users of the View.
This commit addresses this issue by ensuring that the
UrlBasedViewResolvers in spring-webmvc and spring-webflux do not
override the requestContextAttribute in a View if the
UrlBasedViewResolver has not been explicitly configured with a custom
requestContextAttribute value.
Closes gh-23129
451cce4fe8