vim-patch:7.4.1970 (#5850)

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 vim/vim#892)

70e136e1d8

src/nvim/ex_cmds.c

@@ -2632,7 +2632,7 @@ void 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;
 
@@ -2704,7 +2704,7 @@ void 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);
 
     xfree(theline);
     ++lnum;

src/nvim/testdir/test_alot.vim

@@ -9,6 +9,7 @@ source test_expr.vim
 source test_expr_utf8.vim
 source test_feedkeys.vim
 source test_goto.vim
+source test_jumps.vim
 source test_match.vim
 source test_matchadd_conceal_utf8.vim
 source test_menu.vim

src/nvim/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/nvim/version.c

@@ -470,7 +470,7 @@ static int included_patches[] = {
   1973,
   // 1972,
   1971,
-  // 1970,
+  1970,
   // 1969 NA
   // 1968,
   1967,