Often, in reviewing Wikipedia policy page histories for instance, one sees an edit that seems strange or interesting, but the context of the edit is not completely clear from the edit summary alone. I propose that we add a button in the edit history to jump to that time in a user's contributions, so one can see the other edits they were making around the time that the edit was made.
An example of how this would be useful is if a user edits a policy page in reaction to a Village Pump conversation they are engaging in. As time passes, it will increasingly unlikely that anyone will connect the two conversations and know why they made the edit.
It could also be useful in tracking the context of edits to other kinds of pages. For instance, if someone creates an article on liquid democracy, one might jump to their other contributions around that time and see the discussions and other articles they had been working on, which could lead the reader to some other areas they might want to look at or participate in.
Someone discovering subtle factual errors years later, for instance, could easily look at other edits by that user around that time and check for other errors.
This feature might be something a user could enable through their preferences, if one didn't want to add clutter to the default history page.