[RFC] vim-patch:7.4.543.

Adapt #1533 and #1596 to conform to upstream patch.

Problem:    Since patch 7.4.232 "1,3s/\n//" joins two lines instead of
            three.
            (Eliseo Martínez)  Issue 287
Solution:   Correct the line count. (Christian Brabandt)
            Also set the last used search pattern.