Changes (as compared to 11.2) include:
* The interface for restoring connections from previous session has been changed due to user requests. There is now no popup dialog at startup, but instead a setting in tools .. preferences .. ‘others’ tab.
* Fixed a rare crash in HTTP-tunnel typically happening when copying huge databases or tables. Exact details of this crash would depend on the environment.
* LOAD DATA LOCAL would hang indefinitely if a non-existing file was specified as argument. This bug was introduced in version 11.2.
* In Schema Sync a comma could be missing before a COLLATE clause thus resulting in an invalid SQL statement.