Markdown Easy won't install if Markdown Text Filter already exists

I have the feeling this MR will fundamentally break the module.

I have to agree with @bramdriesen on all of his comments. I would like to see this MR cleaned up a bit and a test added before considering this change (especially because this is a bit of an edge case and a workaround exists.)

-mike

The change in the MR seems overcomplicated, and I'm not sure it fixes the problem that the module won't install if there's a Markdown filter already existing.

Wouldn't a much simpler solution be to move config/install/filter.format.markdown.yml to config/optional/filter.format.markdown.yml?

This would mean that if there's a existing Markdown filter, it would be left as-is, and it would be up to the site builder to apply Markdown Easy to it. I feel this is reasonable as we don't know what might be in an existing filter, so we shouldn't change it. I think expecting a manual reconfiguration of the text filter is reasonable.

I agree with the solution proposed by @lostcarpark. It's much simpler and it works. If you're migrating from the markdown module or already have a markdown filter for any reason, you shouldn't get stuck trying to install markdown_easy.

Patch looks good, but easier for the maintainer if it's a MR.