Why there are TRANS_START and TRANS_INPROGRESS

DT wrote:

I'm reading code of xact.c, and I found the only difference between TRANS_START
and TRANS_INPROGRESS is when transaction aborts in TRANS_START status we set
status to TRANS_INPROGRESS so AbortTransaction() will not report WARNING.
So I wonder to know the reason why we distinguish them?

After reading into it it seems to me that TRANS_START means
"transaction is starting" and TRANS_INPROGRESS means
"transaction successfully started". See StartTransaction()
and StartSubTransaction().

A difference is made in IsTransactionState() where
TRANS_START transactions are not reported as being in a
transaction.

Yours,
Laurenz Albe

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