When the first line(s) in a change are new/added, and subsequent lines are changed, Vim marks the first lines as changed up the number of lines occupied by the original lefthand file, and the subsequent lines as new.  In reality, the first line is new, and the second line is changed. Vim does not correctly recognize the similar/same line. Is there a way resolve this?
vimdiff marks wrong line as added when first line in change is new
vimdiff