patch 8.1.2235: "C" with 'virtualedit' set does not include multi-byte char

Problem:    "C" with 'virtualedit' set does not include multi-byte char.
Solution:   Include the whole multi-byte char. (Nobuhiro Takasaki,
            closes #5152)
diff --git a/src/testdir/test_virtualedit.vim b/src/testdir/test_virtualedit.vim
index 67adede..1e6b26a0 100644
--- a/src/testdir/test_virtualedit.vim
+++ b/src/testdir/test_virtualedit.vim
@@ -73,3 +73,12 @@
   bwipe!
   set virtualedit=
 endfunc
+
+func Test_edit_change()
+  new
+  set virtualedit=all
+  call setline(1, "\t⒌")
+  normal Cx
+  call assert_equal('x', getline(1))
+  bwipe!
+endfunc