Option to only list one entry per type.

I feel like it would be better, if you could set that only one entry of each type (comment, issue open, issue close, pr open, pr close, etc.) would be displayed in the history, or otherwise something like this would pop up:

No files, tests, or entry points are named. Start by tracing how activity history entries are collected and rendered, then determine where an option for limiting entries by type would belong. Done should provide a configurable way to show at most one entry for each activity type, with the behavior covered by tests.

Written by the indexing model from the issue text.