src/vs/platform/workspaces/electron-main/workspacesManagementMainService.ts/WorkspacesManagementMainService/doDeleteUntitledWorkspace
class WorkspacesManagementMainService:	private async doDeleteUntitledWorkspace(workspace: IWorkspaceIdentifier): Promise<void> {
		const configPath = originalFSPath(workspace.configPath);
		try {

			// Delete Workspace
			await Promises.rm(dirname(configPath));

			// Mark Workspace Storage to be deleted
			const workspaceStoragePath = join(this.environmentMainService.workspaceStorageHome.fsPath, workspace.id);
			if (await Promises.exists(workspaceStoragePath)) {
				await Promises.writeFile(join(workspaceStoragePath, 'obsolete'), '');
			}

			// Remove from list
			this.untitledWorkspaces = this.untitledWorkspaces.filter(untitledWorkspace => untitledWorkspace.workspace.id !== workspace.id);
		} catch (error) {
			this.logService.warn(`Unable to delete untitled workspace ${configPath} (${error}).`);
		}
	}