Not visible on firefox

[ahmedmirza994]

When I place twinColGrid inside FormLayout, it is not showing in firefox. Microsoft Edge, Chrome works fine.

[javier-godoy]

This issue seems to be related by Firefox's handling of min-height:0 (which is needed in order to support other configurations), thus currently TwinColGrid requires a fixed height when used inside of FormLayout.

The layout is already quite complex and it should be rewritten from scratch. I tried to fix it so that it works in Firefox when the component is inside of a FormLayout, but couldn't find a way that doesn't break something else.

I'm open to accepting a fix if you figure out what have to be fixed (while preserving backwards compatibility), but otherwise I'm stopping work on this issue, in favor of #92