src/vs/base/browser/ui/list/listWidget.ts/MouseController/updateOptions
class MouseController:	updateOptions(optionsUpdate: IListOptionsUpdate): void {
		if (optionsUpdate.multipleSelectionSupport !== undefined) {
			this.multipleSelectionController = undefined;

			if (optionsUpdate.multipleSelectionSupport) {
				this.multipleSelectionController = this.list.options.multipleSelectionController || DefaultMultipleSelectionController;
			}
		}
	}