Grouping by column breaks the table if tree data exists

[DavidLemayian]

Describe the bug

Grouping by column breaks the table if tree data (parentChildData option) exists

To Reproduce

1. Setup from demo:

   <MaterialTable
     data={TREE_DATA}
     columns={TREE_COLUMNS}
     parentChildData={(row, rows) => rows.find((a) => a.id === row.parentId)}
     options={{
       selection: true,
       grouping: true,
       showGroupingCount: true
     }}
   />

2. and then drag a column to be grouped

Sandbox: https://codesandbox.io/s/nervous-swirles-7427gu?file=/src/App.js:1384-1707

nervous-swirles-7427gu---CodeSandbox.webm

[Domino987]

@DavidLemayian Hi, thanks for reporting this. I am also not sure (apart from the obvious error) on how these two would work together. Would you mind providing an example on how you would expect grouping and tree data to behave in this case?

[stale[bot]]

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