src/vs/workbench/services/preferences/common/preferencesModels.ts/DefaultSettings/initAllSettingsMap
class DefaultSettings:	private initAllSettingsMap(allSettingsGroups: ISettingsGroup[]): void {
		this._settingsByName = new Map<string, ISetting>();
		for (const group of allSettingsGroups) {
			for (const section of group.sections) {
				for (const setting of section.settings) {
					this._settingsByName.set(setting.key, setting);
				}
			}
		}
	}