Today, when a graph has an exposed parameter which is not used inside the graph, it is not present in the SBSAR form of the graph. This prevents using parameters to only control the visibility of other parameters. In some cases, we may want to make visible parameters based on the state of another parameter, even when this other parameter is not used in the graph. Unfortunately the current SBSAR processing is not making this possible. We can workaround this by using a fake node so the parameter is used into the graph, but that is not convenient and impacts the graph processing.
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