Feature-request: Please enhance rollback-on-error option for ARM template deployment

Hello,

There are certain caveats mentioned with the rollback feature here:
https://docs.microsoft.com/en-us/azure/azure-resource-manager/resource-group-template-deploy-cli#redeploy-when-deployment-fails

My request:
1) Please support this option for 'incremental' mode deployment template also.
2) Please support "pure" rollback. Whatever resources were specified in the incremental mode template should be rolled back to their previous states. In other words, the system would take a snapshot before deploying the template and roll back to that checkpoint when deployment fails with error.

Thanks,
Sourabh

Start by reading the linked Azure documentation on redeploying when deployment fails, then compare the stated behavior for incremental deployments with the requested rollback-on-error option. Done would mean supporting incremental-mode rollback and restoring the specified resources to their previous states after a failed deployment; the issue names no files, tests, or implementation entry point.

Written by the indexing model from the issue text.