Feature request: Discard Dashboard pending edits

Please give a quick overview of your product feature request or feedback and note who in your org is affected by this issue [ex. agents, admins, customers, etc.]. (2-3 sentences)

When there a changes pending in the Explore Dashboard (Classic), dashboard builders are prompted to either preview or publish those changes. This means that builders cannot test out drafts efficiently. This also means that a builder cannot sit down with a dashboard user to have a working session without being stuck with the changes.

What problem do you see this solving? (1-2 sentences) 

If there were an option to discard changes, it would be easier to develop new dashboards without fear of being stuck with rolling back draft changes with only the undo button.

When was the last time you were affected by this lack of functionality, or specific tool? What happened? How often does this problem occur and how does this impact your business? (3-4 sentences)

This is an on-going issue. This impacts the ability for builders to try out or experiment with new dashboard designs.

Are you currently using a workaround to solve this problem? (If yes, please explain) (1-2 sentences)

The only workaround presently available is to roll back changes with the undo button.

What would be your ideal solution to this problem? How would it work or function? (1-2 sentences)

Add a 'discard pending changes' option in addition to the existing preview and publish options. (Ideally there would be a version history as well.)