vim-patch:8.0.0547: extra line break in verbosefile

Problem:    Extra line break in verbosefile when using ":echomsg". (Ingo
            Karkat)
Solution:   Don't call msg_start(). (closes vim/vim#1618)
52604f2454

src/nvim/eval.c

@@ -19533,7 +19533,6 @@ void ex_execute(exarg_T *eap)
       // follows is displayed on a new line when scrolling back at the
       // more prompt.
       msg_sb_eol();
-      msg_start();
     }
 
     if (eap->cmdidx == CMD_echomsg) {

src/nvim/testdir/test_cmdline.vim

@@ -430,4 +430,14 @@ func Test_getcmdtype()
   cunmap <F6>
 endfunc
 
+func Test_verbosefile()
+  set verbosefile=Xlog
+  echomsg 'foo'
+  echomsg 'bar'
+  set verbosefile=
+  let log = readfile('Xlog')
+  call assert_match("foo\nbar", join(log, "\n"))
+  call delete('Xlog')
+endfunc
+
 set cpo&