QSqlTableModel can't update existing record

QSqlTableModel return error when update existing record.

In qsqldriver.cpp at line 509 (after case WhereStatement used escaped table name:

prepareIdentifier(tableName, QSqlDriver::TableName, this)

while in other places in qsqldriver.cpp tableName used 'clean' as it should be.

QSqlDriver::sqlStatement SHOULD NOT escape table name. Developer must use properly table name (in double quotes if need) when setTable for QSqlTableModel. It has sense in cross-database applications.

Common practice is not use double quotes when write SQL statements (or scripts), so select * from table1 is equal select * from "TABLE1" in Oracle and select * from "table1" in PostgreSQL.

Everything worked fine in version 5.5.0

I think it is associated with QTBUG-9399 which is absolutely wrong