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Propagates notificationData and calls considerforNotification on everyone in the commander stack of the focused window (usually includes the scene assistant, stage assistant and app assistant). As the notificationData propagates through the chain, each assistant (before the app assistant) should remove any properties not needed for building a notification and return the remaining data, which can then be used by the app assistant's considerForNotification function to call showBanner or create or update a dashboard stage.