patch 8.0.1811: no test for winrestcmd()

Problem:    No test for winrestcmd().
Solution:   Add a test. (Dominique Pelle, closes #2894)

src/testdir/test_window_cmd.vim

@@ -507,4 +507,19 @@ func Test_visual_cleared_after_window_split()
   bwipe!
 endfunc
 
+func Test_winrestcmd()
+  2split
+  3vsplit
+  let a = winrestcmd()
+  call assert_equal(2, winheight(0))
+  call assert_equal(3, winwidth(0))
+  wincmd =
+  call assert_notequal(2, winheight(0))
+  call assert_notequal(3, winwidth(0))
+  exe a
+  call assert_equal(2, winheight(0))
+  call assert_equal(3, winwidth(0))
+  only
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1811,
 /**/
     1810,
 /**/