Currently of diff pages, moved paragraphs are considered a deletion and a subsequent addition. This leads to the situation that people always need to read through all moved paragraphs to make sure, that nothing has changed apart from the position.
Using the currently existing display methods, show changes in moved text chunks. This means, that only the part that changed is highlighted.
Diff engine changes need to be implemented both for php and c++. This ticket covers the C++ part
This is part of fulfilling wish #2 of the 2015 German-speaking community wishlist survey: T139603: Show text changes when moving text chunks (#2)