What's Changed
- Fix subflow module sending messages to debug sidebar by @knolleary in #4642
- Guard refresh of unknown subflow by @knolleary in #4640
- Fix use of spawn on windows with cmd files by @knolleary in #4652
- Prevent subflow being added to itself by @knolleary in #4654
- Bump for 3.1.9 release by @knolleary in #4655
Full Changelog: 3.1.8...3.1.9