Feature request: Improved diffs

[cpboyd]

Description

Currently, it seems like any time certain blocks are added/removed (e.g. destination {} on argocd_project) then it lists all blocks as being removed and re-added.

With ArgoCD projects that have several destinations specified, this makes it very difficult to track what the actual changes are:

          - destination {
              - namespace = "api" -> null
              - server    = "https://server-1" -> null
            }
          - destination {
              - namespace = "api" -> null
              - server    = "https://server-2" -> null
            }
          - destination {
              - namespace = "api" -> null
              - server    = "https://server-3" -> null
            }
          - destination {
              - namespace = "api" -> null
              - server    = "https://server-4" -> null
            }
          - destination {
              - namespace = "argo-*" -> null
              - server    = "https://server-1" -> null
            }
          - destination {
              - namespace = "argo-*" -> null
              - server    = "https://server-2" -> null
            }
          - destination {
              - namespace = "argo-*" -> null
              - server    = "https://server-3" -> null
            }
          - destination {
              - namespace = "argo-*" -> null
              - server    = "https://server-4" -> null
            }
          - destination {
              - namespace = "pub" -> null
              - server    = "https://server-1" -> null
            }
          - destination {
              - namespace = "pub" -> null
              - server    = "https://server-2" -> null
            }
          - destination {
              - namespace = "pub" -> null
              - server    = "https://server-3" -> null
            }
          - destination {
              - namespace = "pub" -> null
              - server    = "https://server-4" -> null
            }
          - destination {
              - namespace = "sec" -> null
              - server    = "https://server-2" -> null
            }
          - destination {
              - namespace = "sec" -> null
              - server    = "https://server-3" -> null
            }
          - destination {
              - namespace = "sec" -> null
              - server    = "https://server-4" -> null
            }
          - destination {
              - namespace = "test" -> null
              - server    = "https://server-1" -> null
            }
          - destination {
              - namespace = "test" -> null
              - server    = "https://server-2" -> null
            }
          - destination {
              - namespace = "test" -> null
              - server    = "https://server-3" -> null
            }
          - destination {
              - namespace = "test" -> null
              - server    = "https://server-4" -> null
            }
          - destination {
              - namespace = "test" -> null
              - server    = "https://kubernetes.default.svc" -> null
            }
          - destination {
              - namespace = "ui" -> null
              - server    = "https://server-1" -> null
            }
          - destination {
              - namespace = "ui" -> null
              - server    = "https://server-2" -> null
            }
          - destination {
              - namespace = "ui" -> null
              - server    = "https://server-3" -> null
            }
          - destination {
              - namespace = "ui" -> null
              - server    = "https://server-4" -> null
            }
          - destination {
              - namespace = "sec" -> null
              - server    = "https://server-1" -> null
            }
          + destination {
              + namespace = "map"
              + server    = "https://server-1"
            }
          + destination {
              + namespace = "map"
              + server    = "https://server-2"
            }
          + destination {
              + namespace = "map"
              + server    = "https://server-3"
            }
          + destination {
              + namespace = "map"
              + server    = "https://server-4"
            }
          + destination {
              + namespace = "api"
              + server    = "https://server-1"
            }
          + destination {
              + namespace = "api"
              + server    = "https://server-2"
            }
          + destination {
              + namespace = "api"
              + server    = "https://server-3"
            }
          + destination {
              + namespace = "api"
              + server    = "https://server-4"
            }
          + destination {
              + namespace = "argo-*"
              + server    = "https://server-1"
            }
          + destination {
              + namespace = "argo-*"
              + server    = "https://server-2"
            }
          + destination {
              + namespace = "argo-*"
              + server    = "https://server-3"
            }
          + destination {
              + namespace = "argo-*"
              + server    = "https://server-4"
            }
          + destination {
              + namespace = "pub"
              + server    = "https://server-1"
            }
          + destination {
              + namespace = "pub"
              + server    = "https://server-2"
            }
          + destination {
              + namespace = "pub"
              + server    = "https://server-3"
            }
          + destination {
              + namespace = "pub"
              + server    = "https://server-4"
            }
          + destination {
              + namespace = "sec"
              + server    = "https://server-1"
            }
          + destination {
              + namespace = "sec"
              + server    = "https://server-2"
            }
          + destination {
              + namespace = "sec"
              + server    = "https://server-3"
            }
          + destination {
              + namespace = "sec"
              + server    = "https://server-4"
            }
          + destination {
              + namespace = "test"
              + server    = "https://server-1"
            }
          + destination {
              + namespace = "test"
              + server    = "https://server-2"
            }
          + destination {
              + namespace = "test"
              + server    = "https://server-3"
            }
          + destination {
              + namespace = "test"
              + server    = "https://server-4"
            }
          + destination {
              + namespace = "test"
              + server    = "https://kubernetes.default.svc"
            }
          + destination {
              + namespace = "ui"
              + server    = "https://server-1"
            }
          + destination {
              + namespace = "ui"
              + server    = "https://server-2"
            }
          + destination {
              + namespace = "ui"
              + server    = "https://server-3"
            }
          + destination {
              + namespace = "ui"
              + server    = "https://server-4"
            }

Potential Terraform Configuration

I know that other modules have changed from list to map for easier diffs. I'm not sure if maybe using blocks (instead of a map or some other structure) for this is causing the issue here.

Maybe there's also something with how the provider is rendering the pending changes that could be adjusted, like putting the new stuff last (since in this specific example, the only addition is the namespace = "map")

References

hashicorp/terraform#21901

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