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the edit summaries in the drop down use use to browse revisions of an answer looks truncated, like there's more to see. How do I see the rest of the summary?
You can see the full summary of your own edits listed in your profile page:
When viewing specific question or answer that was edited, you can click the "edited [time] ago" link:
And you will reach the revisions list, showing full summary of all edits made on that post. (example)