updated for version 7.4.517
Problem:    With a wrapping line the cursor may not end up in the right place.
	    (Nazri Ramliy)
Solution:   Adjust n_extra for a Tab that wraps. (Christian Brabandt)
Added tag v7-4-517 for changeset 93560d4bca68
updated for version 7.4.518
Problem:    Using status line height in width computations.
Solution:   Use one instead. (Hirohito Higashi)
Added tag v7-4-518 for changeset 383cb9ddb561