140169: XAResource.commit succeeds for rollback exception during XAResource.end
During an earlier fix for case 102827 in release 3.7.8 (connection leak for errors during XAResource.end), we disabled throwing exceptions originating from XAResource.end, assuming that XAResource.prepare would subsequently refuse to prepare or commit the Xid in question. It turns out that there was a problem with this assumption and the way it was implemented in the code, which caused this issue. This has been fixed, and of course we've added a test to prevent future regression.
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