User request from Sv.wp for an equivalent to "Compare selected revisions" as is available in wikitext page history.
This will enable a user who is not subscribing to a board, to still check on which activity is the most recent, in a topic, or a post.
One suggested solution would be to use the "blue line highlight" - as seen in links like https://www.mediawiki.org/w/index.php?title=Topic:Sptu5vsmp6qy7jta&fromnotif=1&topic_showPostId=spvow32y5ltrzh8s#flow-post-spvow32y5ltrzh8s for any posts that were added/edited during the selected timespan. This would not show classic diffs, but it would show new content in context (which can be very hard to understand from a diff).
Discussion at: