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Created by: eseliger
This fixes an error where the reconciler would determine an empty delta between changeset specs, when the user applies again before a changeset record was processed or had errored.
I hope I am not missing something. @mrnugget asking you for special care when reviewing as you probably have the most insight into the rewirer/reconciler since you originally wrote most of them. I hope this doesn't have other side-effects.
Closes https://github.com/sourcegraph/sourcegraph/issues/16041