Carousel: when sizeToContent = true, navigation button disappears

Webix JS
1

Hi,
When I set in carousel sizeToContent = true, navigation button disappears, see snippet
http://webix.com/snippet/84c3de0f

2

Actually I found it, so the correct question is why carousel set width bigger than container?

3

I see that it is caused by “autoheight: true” in cols.push({ view: “template”, content: views[i].id, autoheight: true });

It is not clear to me why it is happening.
Please explain.

Thank you,
Alexander