Developer can create a pipeline using a subversion repository. Branches are automatically discovered and built. If the branch does not contain a Jenkinsfile the developer can use the pipeline editor to create their first Pipeline. The pipeline can be edited and saved at any time.
Blue Ocean only supports Git and Gitlab repositories.
Please add support for Subversion for pipeline creation.
Subversion seems to have the ability to "import" and "export" a single file from a repository which makes it technically feasible to provide read/write support in the editor