How to prevent expanded row getting collapsed on state update in mui-datatable (^2.15.0)

I'm trying to display nested rows , which includes expandable rows. The inner level rows has a button click on a cell, which is doing a setState onClick of it.

## Expected Behavior
If User has clicked on the Expand row (outer row) which then lists out all the inner rows which has an onClick function in a cell.
So, if User has already expanded a row, And then click on Button displayed in the inner level of rows.

Then Expanded row should not collapse . (Basically TableState for expandedRows should be remembered and only if the User clicks on that Expand/Collapse icon, the row should be expanded/collapsed accordingly.)

## Current Behavior
The expanded row is getting collapsed on a State Update that happens in the inner level of nested rows, onClick of button stateUpdate is resetting the expandedRows of tableState.

## Steps to Reproduce (for bugs)
1. Click on Expand Icon - This expands all the rows
2. Click on Attach Icon - Opens the dialog does some setState
But this collapses already expanded rows

## UI

| Tech | Version |
|--------------|---------|
| Material-UI | ^4.11.3 |
| MUI-datatables | ^2.15.0 |
| React | ^16.13.1 |

Start by reproducing the nested expandable-row case described in the issue: expand a row, click the Attach button, and observe the state update. Trace how the table state handles expandedRows during that update. Done means inner-row actions and other state updates preserve expanded rows until the user explicitly collapses them.

Written by the indexing model from the issue text.