Widget to show other posts by co-authors

I would like to list all other posts by co-authors of a post in the sidebar menu. Is there a straightforward way of doing that?

The issue requests a widget in the post sidebar listing other posts by the post's co-authors. Start by reviewing the plugin's existing co-author and widget or sidebar entry points, then clarify how matching posts should be selected and displayed. Done means the widget reliably shows each co-author's other posts; no files or tests are named.

Written by the indexing model from the issue text.