I just lost a whole morning's work. Here's what I did:
I needed to base a new component on an existing one. So, in
the FB3 file list I right-click, copy file, paste file, rename to
new name. Open up the new file and do my work on it. I saved the
file several times as I normally do as I work, and ran and debugged
the program many times.
Then, at one point I did command-Z to undo something.
However, I guess the editor did not have focus. Instead of undoing
my typing, the tab I was working on closed. The undo/redo menu read
"Redo duplicate file". Worst of all, the newer file -- the one i
had been working on all day -- had reverted back to the way it was
when I first duplicated it, i.e. a clone of file 1. All the work I
had done to transform the file 1 clone into file 2 was lost. Even
the Finder modification date was the same as file 1. No trace of
the file versions saved today.
I have never seen a program overwriting a never file with an
old one with no dialog or warning. I realize nothing can be done, I
need to re-do my work, but to other be aware. I will never
duplicate a file or perform any file operation from within FB from
now on, I will use the OS.