Maybe add arrows to the lines? Something to make it clear to newbies what it means?
|Open||None||T143341 When re-starting a local draft, show the user a diff so they know what they're getting into|
|Open||None||T105173 HTML diffs of edits for everything|
|Resolved||Tchanders||T143350 Let users choose a visual or wikitext diff in the review-your-changes tab|
|Resolved||Esanders||T151405 Have the visual diff system display tree node moves more clearly|