Please add “Revert to last valid config” button near “Configuration validation” button
I don’t see how this is helpful. The idea is to debug your configuration changes rather than wipe them out completely so you have to start from scratch again.
I suspect it would be useful if somebody changes their configuration, it doesn’t pass, so they change it again, and again, and again in an effort to get it to pass, and it never does, so they just want to get back to where they started and have a working config again.
I’d comment out what I’d added so I could come back to it later but I suppose I can see it would be useful if time was a factor. i.e. quick fix before rushing out the door.