extensions/git/src/statusbar.ts/CheckoutStatusBar/command
class CheckoutStatusBar:	get command(): Command | undefined {
		const rebasing = !!this.repository.rebaseCommit;
		const title = `$(git-branch) ${this.repository.headLabel}${rebasing ? ` (${localize('rebasing', 'Rebasing')})` : ''}`;

		return {
			command: 'git.checkout',
			tooltip: localize('checkout', "Checkout branch/tag..."),
			title,
			arguments: [this.repository.sourceControl]
		};
	}