If I set cellHeight to some vh, only first grid will take vh, rest will use px #1217

Subject of the issue

If I set cellHeight to a vh measure, like 7vh, only the first grid will be initialized with 7vh, others will use 7px for some reason.

Your environment

1.1.0 Newest, served from CDN
Brave Version 1.4.96 Chromium: 80.0.3987.132 (Official Build) (64-bit)

Steps to reproduce

1. Make multiple grids.
2. Gridstack options should contain a vh unit for the cellHeight property, like '7vh'
3. Initialize them with Gridstack.initAll(options).

Expected behaviour

All grids should have a height of 84vh.

Actual behaviour

First grid has a height of 84vh, others have 84px.