Cisco RSTP Sync mechanism

Here is an excerpt from a Cisco doc:

"Cisco introduced an enhancement to the sync
mechanism that allows a
bridge to put only its former root port in the discarding state when
it syncs.
Details of how this mechanism works are beyond the scope of this
document.
However, one can safely assume that it is invoked in most common
reconvergence
cases."

Does anybody have any information regarding this mechanism?

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