When viewing the difference (diff) of my contribution recently, I noticed that if I add a new paragraph above (before) an existing paragraph, and also change some text in the existing paragraph, the side-by-side diff is incorrectly shown. The new paragraph on right is aligned with the existing paragraph on the left, and their texts are compared, while the modified existing paragraph on the right is shown as a new paragraph. This is very wrong and needs to be fixed!
https://en.wikipedia.org/w/index.php?title=The_Interview_%282014_film%29&diff=prev&oldid=648145143
There are also other problems like when a paragraph is split into two, the second paragraph on the right is treated as a new one, rather than being compared to the text of the first paragraph on the left.
https://en.wikipedia.org/w/index.php?title=The_Interview_%282014_film%29&diff=prev&oldid=648153747