MDEV-10949: innodb_disallow_writes does not work as expected

Test seems to pass fine.

mysql-test/suite/galera/disabled.def

@@ -54,7 +54,6 @@ galera_pc_ignore_sb : MDEV-13549 Galera test failures 10.1
 galera_lock_table : MDEV-13549 Galera test failures 10.1
 MW-284 : MDEV-13549 Galera test failures 10.1
 galera_as_slave : MDEV-13549 Galera test failures 10.1
-galera_var_innodb_disallow_writes : MDEV-10949
 galera_kill_applier : race condition at the start of the test
 MW-328C: MDEV-13549 Galera test failures 10.1
 MW-328A: MDEV-13549 Galera test failures 10.1

mysql-test/suite/galera/r/galera_var_innodb_disallow_writes.result

@@ -5,6 +5,12 @@ CREATE TABLE t1 (f1 INTEGER) Engine=InnoDB;
 SET GLOBAL innodb_disallow_writes=ON;
 INSERT INTO t1 VALUES (1);;
 connection node_1a;
+SELECT COUNT(*) = 1 FROM t1;
+COUNT(*) = 1
+0
+SELECT COUNT(*) = 1 FROM t1;
+COUNT(*) = 1
+0
 SET GLOBAL innodb_disallow_writes=OFF;
 connection node_1;
 SELECT COUNT(*) = 1 FROM t1;

mysql-test/suite/galera/t/galera_var_innodb_disallow_writes.test

@@ -18,8 +18,10 @@ SET GLOBAL innodb_disallow_writes=ON;
 --send INSERT INTO t1 VALUES (1);
 
 --connection node_1a
+SELECT COUNT(*) = 1 FROM t1;
 let $wait_condition = SELECT 1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE INFO = 'INSERT INTO t1 VALUES (1)' AND State = 'query end';
 --source include/wait_condition.inc
+SELECT COUNT(*) = 1 FROM t1;
 
 SET GLOBAL innodb_disallow_writes=OFF;