src/vs/platform/list/browser/listService.ts/WorkbenchTreeInternals/updateOptions
class WorkbenchTreeInternals:	updateOptions(options: IWorkbenchTreeInternalsOptionsUpdate): void {
		if (options.multipleSelectionSupport !== undefined) {
			this.listSupportsMultiSelect.set(!!options.multipleSelectionSupport);
		}
	}