kernel32: Don't store the current codepage in the thread data.

dlls/kernel32/kernel_private.h

@@ -27,12 +27,11 @@ struct tagSYSLEVEL;
 
 struct kernel_thread_data
 {
-    UINT                code_page;      /* thread code page */
     WORD                stack_sel;      /* 16-bit stack selector */
     WORD                htask16;        /* Win16 task handle */
     DWORD               sys_count[4];   /* syslevel mutex entry counters */
     struct tagSYSLEVEL *sys_mutex[4];   /* syslevel mutex pointers */
-    void               *pad[44];        /* change this if you add fields! */
+    void               *pad[45];        /* change this if you add fields! */
 };
 
 static inline struct kernel_thread_data *kernel_get_thread_data(void)

dlls/kernel32/locale.c

@@ -222,7 +222,8 @@ static const union cptable *get_codepage_table( unsigned int codepage )
     case CP_UTF8:
         break;
     case CP_THREAD_ACP:
-        if (!(codepage = kernel_get_thread_data()->code_page)) return ansi_cptable;
+        if (NtCurrentTeb()->CurrentLocale == GetUserDefaultLCID()) return ansi_cptable;
+        codepage = get_lcid_codepage( NtCurrentTeb()->CurrentLocale );
         /* fall through */
     default:
         if (codepage == ansi_cptable->info.codepage) return ansi_cptable;
@@ -2057,7 +2058,6 @@ BOOL WINAPI SetThreadLocale( LCID lcid )
         }
 
         NtCurrentTeb()->CurrentLocale = lcid;
-        kernel_get_thread_data()->code_page = get_lcid_codepage( lcid );
     }
     return TRUE;
 }