How can I search for all questions that involve participation by two particular users?
For example, I want to search for all of a particular user's questions that I have answered.
I'm not sure whether I'm asking to find direct interactions or indirect interactions.
In other words, if the two users left two answers to the same question, or commented on two different answers to the same question, but didn't interact directly, I'm not sure if I want that to count.
EDIT: With the new Lucene search, this still doesn't work!