patch 8.1.1139: no test for what is fixed in patch 8.1.0716

Problem:    No test for what is fixed in patch 8.1.0716.
Solution:   Add a test. (Yasuhiro Matsumoto, closes #3797)

src/testdir/test_ins_complete.vim

@@ -186,12 +186,15 @@ endfunc
 
 func Test_CompleteDoneNone()
   au CompleteDone * :call <SID>CompleteDone_CheckCompletedItemNone()
+  let oldline = join(map(range(&columns), 'nr2char(screenchar(&lines-1, v:val+1))'), '')
 
   set completefunc=<SID>CompleteDone_CompleteFuncNone
   execute "normal a\<C-X>\<C-U>\<C-Y>"
   set completefunc&
+  let newline = join(map(range(&columns), 'nr2char(screenchar(&lines-1, v:val+1))'), '')
 
   call assert_true(s:called_completedone)
+  call assert_equal(oldline, newline)
 
   let s:called_completedone = 0
   au! CompleteDone

src/version.c

@@ -771,6 +771,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1139,
 /**/
     1138,
 /**/