src/vs/platform/list/browser/listService.ts/MultipleSelectionController/registerListeners
class MultipleSelectionController:	private registerListeners(): void {
		this._register(this.configurationService.onDidChangeConfiguration(e => {
			if (e.affectsConfiguration(multiSelectModifierSettingKey)) {
				this.useAltAsMultipleSelectionModifier = useAltAsMultipleSelectionModifier(this.configurationService);
			}
		}));
	}