user32: Cache current keyboard layout name.

dlls/user32/input.c

@@ -1129,6 +1129,7 @@ BOOL WINAPI GetKeyboardLayoutNameA(LPSTR pszKLID)
  */
 BOOL WINAPI GetKeyboardLayoutNameW( WCHAR *name )
 {
+    struct user_thread_info *info = get_user_thread_info();
     WCHAR klid[KL_NAMELENGTH], value[5];
     DWORD value_size, tmp, i = 0;
     HKEY hkey;
@@ -1142,6 +1143,12 @@ BOOL WINAPI GetKeyboardLayoutNameW( WCHAR *name )
         return FALSE;
     }
 
+    if (info->kbd_layout_id)
+    {
+        swprintf( name, KL_NAMELENGTH, L"%08X", info->kbd_layout_id );
+        return TRUE;
+    }
+
     layout = GetKeyboardLayout( 0 );
     tmp = HandleToUlong( layout );
     if (HIWORD( tmp ) == LOWORD( tmp )) tmp = LOWORD( tmp );
@@ -1166,6 +1173,8 @@ BOOL WINAPI GetKeyboardLayoutNameW( WCHAR *name )
         RegCloseKey( hkey );
     }
 
+    info->kbd_layout_id = wcstoul( name, NULL, 16 );
+
     TRACE_(keyboard)( "ret %s\n", debugstr_w( name ) );
     return TRUE;
 }
@@ -1394,6 +1403,7 @@ HKL WINAPI ActivateKeyboardLayout( HKL layout, UINT flags )
 
     old_layout = info->kbd_layout;
     info->kbd_layout = layout;
+    if (old_layout != layout) info->kbd_layout_id = 0;
 
     if (!old_layout) return get_locale_kbd_layout();
     return old_layout;

dlls/user32/user_private.h

@@ -198,6 +198,7 @@ struct user_thread_info
     ULONG_PTR                     GetMessageExtraInfoVal; /* Value for GetMessageExtraInfo */
     struct user_key_state_info   *key_state;              /* Cache of global key state */
     HKL                           kbd_layout;             /* Current keyboard layout */
+    DWORD                         kbd_layout_id;          /* Current keyboard layout ID */
     HWND                          top_window;             /* Desktop window */
     HWND                          msg_window;             /* HWND_MESSAGE parent window */
     struct rawinput_thread_data  *rawinput;               /* RawInput thread local data / buffer */