Unfortunately, it doesn't make a difference if we call
cancel_transaction or not, all uncommited changes are discarded if
there is an open (unflushed) transaction.
---
 lib/database.cc | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/lib/database.cc b/lib/database.cc
index 96458f6f..db7feca2 100644
--- a/lib/database.cc
+++ b/lib/database.cc
@@ -502,17 +502,9 @@ notmuch_database_close (notmuch_database_t *notmuch)
      * close it.  Thus, we explicitly close it here. */
     if (notmuch->open) {
        try {
-           /* If there's an outstanding transaction, it's unclear if
-            * closing the Xapian database commits everything up to
-            * that transaction, or may discard committed (but
-            * unflushed) transactions.  To be certain, explicitly
-            * cancel any outstanding transaction before closing. */
-           if (_notmuch_database_mode (notmuch) == 
NOTMUCH_DATABASE_MODE_READ_WRITE &&
-               notmuch->atomic_nesting)
-               notmuch->writable_xapian_db->cancel_transaction ();
-
            /* Close the database.  This implicitly flushes
-            * outstanding changes. */
+            * outstanding changes. If there is an open (non-flushed)
+            * transaction, ALL pending changes will be discarded */
            notmuch->xapian_db->close ();
        } catch (const Xapian::Error &error) {
            status = NOTMUCH_STATUS_XAPIAN_EXCEPTION;
-- 
2.30.2
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