Problem/Motivation
When creating a subtheme of Event Horizon, the subtheme inherits the theme config page, but does not keep the same schema. This results in the theme logic for items like the texture failing.
Steps to reproduce
Create a subtheme of Event Horizon (I think I did it with drush generate)
Save the settings
Observe the settings.yml has different schema.

Proposed resolution
I tried copying config/schema/event_horizon.schema.yml to the new theme, but that didn't have an effect, it seems like much of the form logic might need to be copied too?
See https://github.com/MidCamp/midcamp-ep work WIP
Remaining tasks
User interface changes
API changes
Data model changes
Comments
Comment #2
mandclu commentedI believe this was recently fixed in #3600753: Configuration options broken on subthemes but please reopen if not.