For example, in the diff:
The edit separated the second sentence as the start of a new paragraph and inserted the text, shown at the beginning of the green field, as part of the first paragraph. The second sentence and after, now a separate paragraph, is still shown highlighted in green.
A search/comparison function inserted after the diff is formed which compares the pre-existing version and the diff output text, could unmark the pre-existing text from green to a nominal yellow color. This helps to distinguish text which has added from pre-existing text which has simply been shifted, moved, or transplanted.