main grid height issue, while adding subGrids

[santoshofc]

Subject of the issue

please check the below screen shot

Your environment

• version of gridstack.js AND if using HTML5 vs Jquery plugin (v3+) - DON'T SAY LATEST as that doesn't mean anything a month/year from now.
• which browser/OS

Steps to reproduce

You MUST provide a working demo (keep it simple!) you can use
https://jsfiddle.net/adumesny/jqhkry7g

Expected behavior

Tell us what should happen

Actual behavior

Tell us what happens instead

[adumesny]

file a proper bug if lib issue. else use slack channel for questions