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When we scroll down the Tree Grid add new record with addRecord method and specific index, the new record will get added. Since the Grid refreshes, first record will be in current view port (as in initial rendering). But we need to show the newly added record in current view port.
Replication Procedure:
Sample:
https://stackblitz.com/edit/angular-editcell-virtual-tiwgrh?file=app.component.ts
In the above sample, scroll down and add child with button click.
Child get added but Tree Grid get refreshed thus showing 1st record in view instead of newly added record