Unfortunately, I looked at my power strip the wrong way and my desktop shut off.
I was in the middle of editing a file, hadn't saved it for a few hours with GIT, but I had gone in and out of PHP storm while debugging so the file was saved many time.
When I turned the power back on, the file was empty. I remembered reading something about Local History. Unfortunately, for this particular file, the history was also empty.
Other files, which did not get trashed, had full histories over the whole day.
I resurrected the changes, but it's a litte worrisome going forward.