vim-patch:8.1.1932: ml_get errors after append() #10866

Problem:  Ml_get errors after using append(). (Alex Genco)
Solution: Do not update the cursor twice.

d20070274c

fix #10847

src/nvim/testdir/test_functions.vim

@@ -592,6 +592,15 @@ func Test_mode()
   set complete&
 endfunc
 
+func Test_append()
+  enew!
+  split
+  call append(0, ["foo"])
+  split
+  only
+  undo
+endfunc
+
 func Test_getbufvar()
   let bnr = bufnr('%')
   let b:var_num = '1234'