extensions/git/src/commands.ts/CommandCenter/stageAllUntracked
class CommandCenter:	async stageAllUntracked(repository: Repository): Promise<void> {
		const resources = [...repository.workingTreeGroup.resourceStates, ...repository.untrackedGroup.resourceStates]
			.filter(r => r.type === Status.UNTRACKED || r.type === Status.IGNORED);
		const uris = resources.map(r => r.resourceUri);

		await repository.add(uris);
	}