gnucash stable: bugfix xaccTransGetTxnType: avoid returning TXN_TYPE_LINK incorrectly

[Christopher Lam]

Updated	 via  https://github.com/Gnucash/gnucash/commit/4a60e01f (commit)
	from  https://github.com/Gnucash/gnucash/commit/853791cb (commit)



commit 4a60e01fcd6b3fae6acaa2547b60d5aeb74f0dc4
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Tue Jun 13 21:00:58 2023 +0800

    bugfix xaccTransGetTxnType: avoid returning TXN_TYPE_LINK incorrectly
    
    A TXN_TYPE_PAYMENT will have non-APAR splits; a TXN_TYPE_LINK will not
    have non-APAR splits. This bug manifests as a regular TXN_TYPE_PAYMENT
    transaction being later voided being incorrectly changed to
    TXN_TYPE_LINK.



Summary of changes:
 libgnucash/engine/Transaction.c        | 9 ++++-----
 libgnucash/engine/test/utest-Invoice.c | 6 ++++++
 2 files changed, 10 insertions(+), 5 deletions(-)