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My module creates its own text format upon installation by having a file named config/install/filter.format.{format}.yml.
However, I can't uninstall and reinstall the module, because the format persists and will then cause a conflict. ("... already exists in active configuration.")
This looks like a bug in the filter API, but maybe there is some explicit way to delete the format when the module is removed? It's really annoying to have to manually delete the config key every time.
You need to add a dependency in your filter format to the module. Then when the module is uninstalled, the format should get deleted
Text formats are undeletable.
@see this 8.0.x-dev issue: Change the disable user interface with formats. Make it remove.
It is called disable because it's not deleted, it stays there as a format is undeletable, you'll just never be able to get it back ;)
There have been endless and insane discussions and issues around this before the release of 7.x. Headache-causing discussions ;)
To clarify Berdir's points: text formats may not be deleted because almost always there's >0 pieces of content using it, which must still be renderable, which means that the text formats they use must remain available. Hence text formats can only be disabled.
Maybe in the future there'll at least be the option to re-enable them.
@see this 8.5.x-dev issue: Disabled text formats can't be seen in the GUI.
