Last change message is not that useful in source listing

Everytime I look at the source viewer I feel compelled to read the right column, but it's almost never really useful. In the timeline it's sensible, but not in the source view.

When I'm looking at the source listing, I usually want to get an overview of the files. For Python files at least, that would be the first line of the docstring. For other languages, I don't know.