patch 8.0.1411: reading invalid memory with CTRL-W :

Problem:    Reading invalid memory with CTRL-W :.
Solution:   Correct the command characters. (closes #2469)
diff --git a/src/testdir/test_window_cmd.vim b/src/testdir/test_window_cmd.vim
index 067f09c..925cfcc 100644
--- a/src/testdir/test_window_cmd.vim
+++ b/src/testdir/test_window_cmd.vim
@@ -467,4 +467,9 @@
   call test_garbagecollect_now()
 endfunc
 
+func Test_window_colon_command()
+  " This was reading invalid memory.
+  exe "norm! v\<C-W>:\<C-U>echo v:version"
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab