src/vs/workbench/services/preferences/common/preferencesModels.ts/AbstractSettingsModel/removeDuplicateResults
class AbstractSettingsModel:	private removeDuplicateResults(): void {
		const settingKeys = new Set<string>();
		[...this._currentResultGroups.keys()]
			.sort((a, b) => this._currentResultGroups.get(a)!.order - this._currentResultGroups.get(b)!.order)
			.forEach(groupId => {
				const group = this._currentResultGroups.get(groupId)!;
				group.result.filterMatches = group.result.filterMatches.filter(s => !settingKeys.has(s.setting.key));
				group.result.filterMatches.forEach(s => settingKeys.add(s.setting.key));
			});
	}