I just edited this question twice: once to reformat the code (it was included in a
<pre> block), and again to add a direct image link. Because I made these edits within a few minutes of each other, they were folded into one edit in the revision history. However, the revision comment for my first edit ("formatting fixes") is entirely lost.
I'm pretty sure that comments used to be concatenated together with semicolons. This was preferable behaviour to losing all but the final revision comment.