For a given file (and commitish), how do I find the commit which changed that file to be what it is at that point?
For instance, if I have MyFile.txt and tag "V1-2-3", how do I find out what was the last commit which updated MyFile.txt to make it whatever it is at that tag?
To be clear, this isn't asking for a diff, I'm just trying to find the commit info (in this case the user and comment) for the last commit on that file.