openide/plugins/gitlab/resources/graphql/query/mergeRequestSetDraft.graphql

mutation ($projectId: ID!, $mergeRequestId: String!, $isDraft: Boolean!) {
  mergeRequestSetDraft(input: {
    projectPath: $projectId,
    iid: $mergeRequestId,
    draft: $isDraft
  }) {
    mergeRequest {
      ...mergeRequest
    }
    errors
  }
}