Playing around with EDI. I opened a minor text file, removed all text to take some screenshots. I closed EDI without ever saving said document. To my surprise the document was empty. Thankfully nothing I cared about. Most anything you open a file in, modify, and then close. Will prompt you to save your changes. I was never prompted. I assume because it auto saved itself. Either way it was a bit surprising to see a file I did not save be empty.
Something to consider as a better alternative to auto save is auto history. In Netbeans as I type anything it keeps its own local history of the file changes. Basically an auto save feature where I can go back and grab changes, etc. Not sure if its doing it via VC, but displays changes via diff of that time and current file.
There maybe some cases where auto save is desired for some. Though usually done with a ~ preffix as to not mess up original file till saved by someone's direct action. If I edit a file via nano and kill nano, it will output a saved file. Various ways to go about such.
Moot to me as I do not use EDI, but it was a bit surprising thus the feedback. Do with it what you will.