The CI is failing for reasons unrelated to this pull request. See:

• crypton-x509-store-1.6.12 build failure with unix-2.7.3 (GHC 9.4.8) kazu-yamamoto/crypton-certificate#21

See:

• Multi-line flags description produces invalid Cabal file #622

This uses LineSeparatedList so that:

flags:
  my-flag:
    description: |
      This is some text

      This is more some text
    manual: true
    default: true

renders as:

flag my-flag
  description:
      This is some text
      .
      This is more some text
  manual: True
  default: True

otherwise I could not see how to avoid ugly rendering.

What does ugly rendering mean?

Something like this?

flag my-flag
  description: This is some text
               .
               This is more some text
  manual: True
  default: True