Rowspan feature

• Have you already searched for similar issues? yes

• I am looking for Rowspan feature in react-data-grid library. Is there a way to handle it? Rowspan using Groupby.

• Thanks!

Which version of React JS are you using?

✅ Officially supported ✅

• v15.4.x

⚠️ Not officially supported, expect warnings ⚠️

• v15.5.x
• v15.6.x

☣️ Not officially supported, expect warnings and errors ☣️

• v16.x.x

Which browser are you using?

✅ Officially supported ✅

• IE 9 / IE 10 / IE 11
• Edge
• Chrome

⚠️ Not officially supported, but "should work" ⚠️

• Firefox
• Safari

I'm submitting a ...

• Bug Report
• Feature Request

Need general support? Not sure about how to use React itself, or how to get started with the Grid? Please do not submit support request here. Instead see

https://github.com/adazzle/react-data-grid/blob/master/CONTRIBUTING.md

Issue Details

Please include:
- What the current behavior is
Rowspan feature is not supporting
- What the desired behvaior is
Support Rowspan feature
- (If Bug) Steps to reproduce the issue
- (If Feature) The motivation / use case for the feature
GroupBy rows if other rows have same values.
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