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In version 18.x,
reassigning the data field would not set the form control to dirty. Now
it is marked as dirty in version 19.x. This is an issue because we fetch
data to populate the [dataSource] and it should not be marking the form
control as dirty when the data finishes loading. This is also the case
when using a remote-service in combination with the async pipe to
populate the [dataSource]. Here is a demonstration showing the form
control being dirty after the data loads.
https://stackblitz.com/edit/angular-gyejsu-vweb2p?file=app.component.ts