patch 7.4.1970

Problem:    Using ":insert" in an empty buffer sets the jump mark. (Ingo
            Karkat)
Solution:   Don't adjust marks when replacing the empty line in an empty
            buffer. (closes #892)

src/ex_cmds.c

@@ -4372,7 +4372,7 @@ ex_append(exarg_T *eap)
     if (eap->cmdidx != CMD_append)
 	--lnum;
 
-    /* when the buffer is empty append to line 0 and delete the dummy line */
+    /* when the buffer is empty need to delete the dummy line */
     if (empty && lnum == 1)
 	lnum = 0;
 
@@ -4456,7 +4456,7 @@ ex_append(exarg_T *eap)
 
 	did_undo = TRUE;
 	ml_append(lnum, theline, (colnr_T)0, FALSE);
-	appended_lines_mark(lnum, 1L);
+	appended_lines_mark(lnum + (empty ? 1 : 0), 1L);
 
 	vim_free(theline);
 	++lnum;

src/testdir/test_alot.vim

@@ -16,6 +16,7 @@ source test_glob2regpat.vim
 source test_goto.vim
 source test_help_tagjump.vim
 source test_join.vim
+source test_jumps.vim
 source test_lispwords.vim
 source test_matchstrpos.vim
 source test_menu.vim

src/testdir/test_jumps.vim

@@ -0,0 +1,11 @@
+func Test_empty_buffer()
+  new
+  insert
+a
+b
+c
+d
+.
+  call assert_equal(1, line("''"))
+  bwipe!
+endfunc

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1970,
 /**/
     1969,
 /**/