Command FILL Highlight the outcome.

Imagine after the hard work of finding the right coordinates for the FILL command and its a big build so you want to make sure you place it in the exact spot for it to be flush with where you intended it to be. Imagine right before you press enter to deploy your command it highlights exactly what and where your build will be. Also would not hurt to make your chat text stay there so you can close out and check the build out before you finally open the chat back up and deploy the command. Thank you.