Existing contributions matcher: Partial and incorrect payments are closing existing contributions

[thomasrenner]

Problem: A payment with an amount greater than zero, that is registered by civiBanking, automatically closes an existing contribution, no matter if the payment amount matches the contribution amount or not. The status of the contribution is automatically set to "completed".
This is especially problematic if the payment is not a donation, but corresponds to e.g. an event fee or a membership fee.
We have attached 2 patches, that have basically fixed the Problem for us and that we would kindly ask for to be reviewed.
These patches were created during CiviSprint Leipzig 2023

Similar issue from 2020: #298

civibanking_partial_payment_defaultOptionMatcher.patch
civibanking_partial_payment_ExistingContributionMatcher.patch

[eptbertram]

Hej @thomasrenner , how to test those patches? Since I'm a noob I'll need some copy&paste-advice ;)