open-map sample seems not working for hidden window

open-map works fine if window shown from the beginning, but if it’s hidden first and I call .show() on some button click, then tiles look weird - it’s not drawn on all map, only top left side.
http://webix.com/snippet/c5b43ac9

Yep, I can confirm the issue. Check the updated files in Webix Hub.

But please use webix.require instead of including leaflet files in the document head to avoid rendering problems.