src/vs/workbench/services/preferences/common/preferencesModels.ts/DefaultSettings/getMostCommonlyUsedSettings
class DefaultSettings:	private getMostCommonlyUsedSettings(allSettingsGroups: ISettingsGroup[]): ISettingsGroup {
		const settings = coalesce(this._mostCommonlyUsedSettingsKeys.map(key => {
			const setting = this._settingsByName.get(key);
			if (setting) {
				return <ISetting>{
					description: setting.description,
					key: setting.key,
					value: setting.value,
					keyRange: nullRange,
					range: nullRange,
					valueRange: nullRange,
					overrides: [],
					scope: ConfigurationScope.RESOURCE,
					type: setting.type,
					enum: setting.enum,
					enumDescriptions: setting.enumDescriptions,
					descriptionRanges: []
				};
			}
			return null;
		}));

		return <ISettingsGroup>{
			id: 'mostCommonlyUsed',
			range: nullRange,
			title: nls.localize('commonlyUsed', "Commonly Used"),
			titleRange: nullRange,
			sections: [
				{
					settings
				}
			]
		};
	}