A second or two after I made an edit on a post, I noticed that the original author of the post made an edit that changed absolutely nothing. Neither the Stack Overflow difference algorithm nor two different text difference analyzers showed any difference between the two when I pressed source for both edits:
The revision history can be found here:
Usually there is a message that shows up if the content was not changed that says something along the lines of Someone has already submitted an edit. Yours would need to be more substantial in order to added. But, I guess that did not happen here.
Stranger still is that the message for the user was the exact same as the message that appeared on my edit even though they certainly did not edit 4 characters in the body.
It seems as though this is just useless clutter for the revision history and there is not any significant reason to keep that edit in the revision history or even to allow it to be submitted.
I figured I would put the bug report here because it seems like if it happens for Stack Overflow, it would be the same across all sites.
Edit with no differences to content (whitespace was changed in that question)
Just to show that absolutely nothing was changed, this is one of the other websites I used to assure that the sources of the two are indeed exactly the same.