getSeenFeatureIds(/* mPropertyBag */) {
			return Promise.reject("getSeenFeatureIds is not implemented");
		}
Gets the list of all features that the current user has already set to 'Don't show again'.

@param {object} mPropertyBag - Property bag
@param {string} mPropertyBag.layer - Layer to get the correct connector
@returns {Promise<object>} Resolves with a list of viewed features