vim-patch:8.2.1907: complete_info().selected may be wrong

Problem:    Complete_info().selected may be wrong.
Solution:   Update cp_number if it was never set. (issue vim/vim#6945)
f9d51354de

Misc changes:

For variables and function parameters that use "Direction" enum values,
update their type from from "int" to "Direction".
It is hard to review function parameters that must accept
"Direction" enum values only.

src/nvim/spell.c

@@ -79,7 +79,6 @@
 /* for offsetof() */
 #include <stddef.h>
 
-#include "nvim/vim.h"
 #include "nvim/ascii.h"
 #include "nvim/spell.h"
 #include "nvim/buffer.h"
@@ -6653,7 +6652,7 @@ void
 spell_dump_compl (
     char_u *pat,           // leading part of the word
     int ic,                     // ignore case
-    int *dir,           // direction for adding matches
+    Direction *dir,        // direction for adding matches
     int dumpflags_arg              // DUMPFLAG_*
 )
 {
@@ -6820,7 +6819,9 @@ spell_dump_compl (
 
 // Dumps one word: apply case modifications and append a line to the buffer.
 // When "lnum" is zero add insert mode completion.
-static void dump_word(slang_T *slang, char_u *word, char_u *pat, int *dir, int dumpflags, int wordflags, linenr_T lnum)
+static void dump_word(slang_T *slang, char_u *word, char_u *pat,
+                      Direction *dir, int dumpflags, int wordflags,
+                      linenr_T lnum)
 {
   bool keepcap = false;
   char_u      *p;
@@ -6906,7 +6907,7 @@ dump_prefixes (
     slang_T *slang,
     char_u *word,          // case-folded word
     char_u *pat,
-    int *dir,
+    Direction *dir,
     int dumpflags,
     int flags,                  // flags with prefix ID
     linenr_T startlnum