BUG #15170: PQtransactionStatus returns ACTIVE after Empty Commit

The following bug has been logged on the website:

Bug reference:      15170
Logged by:          Rick Gabriel
Email address:      klaxian@gmail.com
PostgreSQL version: 10.3
Operating system:   Ubuntu Linux 16.04
Description:

PQtransactionStatus() incorrectly returns PQTRANS_ACTIVE after committing an
empty transaction block (ie. BEGIN and COMMIT without any other queries).
From the documentation, I would expect PQTRANS_IDLE to be returned in this
case since the connection becomes idle, outside a transaction. If no other
queries are executed on the connection, it never returns to PQTRANS_IDLE
even after waiting for several seconds. I am testing with the PHP 7.1
PostgreSQL module, but I think this is a universal problem with PostgreSQL's
API.