patch 8.0.1419: cursor column is not updated after ]s

Problem:    Cursor column is not updated after ]s. (Gary Johnson)
Solution:   Set the curswant flag.
diff --git a/src/testdir/test_spell.vim b/src/testdir/test_spell.vim
index 54209fe..3e8ba1d 100644
--- a/src/testdir/test_spell.vim
+++ b/src/testdir/test_spell.vim
@@ -28,6 +28,37 @@
   set nospell
 endfunc
 
+func Test_curswant()
+  new
+  call setline(1, ['Another plong line', 'abcdefghijklmnopq'])
+  set spell wrapscan
+  normal 0]s
+  call assert_equal('plong', expand('<cword>'))
+  normal j
+  call assert_equal(9, getcurpos()[2])
+  normal 0[s
+  call assert_equal('plong', expand('<cword>'))
+  normal j
+  call assert_equal(9, getcurpos()[2])
+
+  normal 0]S
+  call assert_equal('plong', expand('<cword>'))
+  normal j
+  call assert_equal(9, getcurpos()[2])
+  normal 0[S
+  call assert_equal('plong', expand('<cword>'))
+  normal j
+  call assert_equal(9, getcurpos()[2])
+
+  normal 1G0
+  call assert_equal('plong', spellbadword()[0])
+  normal j
+  call assert_equal(9, getcurpos()[2])
+
+  bwipe!
+  set nospell
+endfunc
+
 func Test_z_equal_on_invalid_utf8_word()
   split
   set spell