vim-patch:7.4.543.

Adapt #1533 and #1596 to conform to upstream patch
(https://groups.google.com/forum/#!topic/vim_dev/vp0Lwo9f56s).

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.

src/nvim/ex_cmds.c

@@ -3604,9 +3604,10 @@ void do_sub(exarg_T *eap)
       eap->flags = EXFLAG_PRINT;
     }
 
-    linenr_T joined_lines_count = eap->line2 < curbuf->b_ml.ml_line_count
-                                  ? eap->line2 - eap->line1 + 2
-                                  : eap->line2 - eap->line1 + 1;
+    // The number of lines joined is the number of lines in the range
+    linenr_T joined_lines_count = eap->line2 - eap->line1 + 1
+      // plus one extra line if not at the end of file.
+      + eap->line2 < curbuf->b_ml.ml_line_count ? 1 : 0;
     if (joined_lines_count > 1) {
       do_join(joined_lines_count, FALSE, TRUE, FALSE, true);
       sub_nsubs = joined_lines_count - 1;
@@ -3615,6 +3616,11 @@ void do_sub(exarg_T *eap)
       ex_may_print(eap);
     }
 
+    if (!cmdmod.keeppatterns) {
+      save_re_pat(RE_SUBST, pat, p_magic);
+    }
+    add_to_history(HIST_SEARCH, pat, TRUE, NUL);
+
     return;
   }
 

src/nvim/search.c

@@ -246,7 +246,7 @@ char_u *reverse_text(char_u *s) FUNC_ATTR_NONNULL_RET
   return rev;
 }
 
-static void save_re_pat(int idx, char_u *pat, int magic)
+void save_re_pat(int idx, char_u *pat, int magic)
 {
   if (spats[idx].pat != pat) {
     free(spats[idx].pat);

src/nvim/version.c

@@ -187,7 +187,7 @@ static int included_patches[] = {
   //546,
   //545,
   //544,
-  //543,
+  543,
   //542,
   //541,
   //540,