If you accidentally hit CMD/CTRL + A and select all photos and then do CMD/CTRL + SHIFT + R you reset all edits on all photos without any warning at all.
If you are in an edit flurry and don't realize you just did that you have destroyed your library. I know, I did it without realizing it to 200,000 photos.
Please add a dialog to confirm resetting edits, especially if more than one file is selected.