src/vs/platform/configuration/common/configurationModels.ts/ConfigurationModel/getKeysForOverrideIdentifier
class ConfigurationModel:	getKeysForOverrideIdentifier(identifier: string): string[] {
		const keys: string[] = [];
		for (const override of this.overrides) {
			if (override.identifiers.includes(identifier)) {
				keys.push(...override.keys);
			}
		}
		return arrays.distinct(keys);
	}