Change the ROLLBACK command so that pending statements to not block it. The

pending statements instead return SQLITE_ABORT upon next access.  Note: This
causes separate shared-cache connections in read_uncommitted mode to abort as
well.

FossilOrigin-Name: 9b66c79e054c8a109d1ee8d35fed1c42814c330d

test/capi3.test

@@ -894,18 +894,19 @@ do_test capi3-11.9.2 {
   catchsql {
     ROLLBACK;
   }
-} {1 {cannot rollback transaction - SQL statements in progress}}
+} {0 {}}
 do_test capi3-11.9.3 {
   sqlite3_get_autocommit $DB
-} 0
+} 1
 do_test capi3-11.10 {
   sqlite3_step $STMT
-} {SQLITE_ROW}
+} {SQLITE_ERROR}
 do_test capi3-11.11 {
   sqlite3_step $STMT
 } {SQLITE_ROW}
 do_test capi3-11.12 {
   sqlite3_step $STMT
+  sqlite3_step $STMT
 } {SQLITE_DONE}
 do_test capi3-11.13 {
   sqlite3_finalize $STMT
@@ -914,15 +915,15 @@ do_test capi3-11.14 {
   execsql {
     SELECT a FROM t2;
   }
-} {1 2 3}
+} {1 2}
 do_test capi3-11.14.1 {
   sqlite3_get_autocommit $DB
-} 0
+} 1
 do_test capi3-11.15 {
   catchsql {
     ROLLBACK;
   }
-} {0 {}}
+} {1 {cannot rollback - no transaction is active}}
 do_test capi3-11.15.1 {
   sqlite3_get_autocommit $DB
 } 1