Steps to replicate the issue (include links if applicable):

• Go to a simple diff.
• Note that a single word was changed by the edit.
• Now switch from Wikitext to Visual.

What happens?:
A huge diff is displayed, showing that every link was changed, and every line wrap was changed. (And one word was changed.)

What should have happened instead?:
The initial simple diff with the single word being changed should be displayed.