Problem: Currently watchlists show only the very last edit made on an article. Without going to look at the history, there is no way of knowing whether this was an isolated edit or the last in a series of edits by the same user (i.e., major changes or expansion), or the latest salvo in an edit war you had no idea was happening.
Proposed solution: Change "Expand watchlist to show all changes" to include an optional indicator that this was the last edit of X by User:ABC and allow a dropdown click to review all the edits made in that sequence (i.e., byte counts and edit summaries). It could also be highlighted, by user preference, if the edit is part of a sequence of reverts of an edit that is the same or substantially the same, i.e. as a possible edit war. And there are other possibilities.
Who would benefit: Users who work to keep articles stable and at a certain level of quality. And by extension the whole community
More comments: I think this would be of overall benefit to the community by making it easier to respond more quickly to vandalism and disruptive editing, and perhaps minimize the drama that breaks out when one user has just made major changes to the article that another had some time before spent a great deal of time developing.
