Feature requests: diffs / history in safe mode

Could we get some version of notebook diffing and the history feature in safe mode?

I frequently edit notebooks in both a “live” tab and a “safe” tab and sometimes I just want to compare the code between two versions.

Now that I think of it, I also wish there was a way to quickly view the compare link for two arbitrary versions from the history (the “Compare to latest” in the menu is certainly convenient!).