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* GH-8600: Fix WebSocket `removeRegistration` Fixes https://github.com/spring-projects/spring-integration/issues/8600 When we register a dynamic WebSocket endpoint and use a `WebSocketHandlerDecoratorFactory` such an endpoint is not removed on an `IntegrationFlow` destruction. The actual `WebSocketHandler` is decorated, however we still use an initial one for condition. * Refactor `IntegrationWebSocketContainer` to expose a `protected` setter for the `WebSocketHandler` which is called from the `ServerWebSocketContainer` after decoration **Cherry-pick to `6.0.x` & `5.5.x`** * Fix language in Javadocs Co-authored-by: Gary Russell <grussell@vmware.com> --------- Co-authored-by: Gary Russell <grussell@vmware.com>