I highly, highly doubt this would ever be made. Of course checking for errors is possible (Plus! had a debugger built in) but clicking a "would you like this corrected" button is very unlikely to happen. The debugger window tells you the area the problem is in however.
I might be entirly wrong, and a "would you like this corrected" button might be possible
. But for notepad... just write your code in there and copy/paste it into Plus!
.
Short answer: No, there is no program like this (that I have ever heard of).