user32: Map WM_CHAR wparam in ASCII to Unicode in IsDialogMessageA() for CJK locales.

dlls/user32/message.c

@@ -814,8 +814,12 @@ BOOL WINAPI DECLSPEC_HOTPATCH GetMessageA( MSG *msg, HWND hwnd, UINT first, UINT
  */
 BOOL WINAPI IsDialogMessageA( HWND hwndDlg, LPMSG pmsg )
 {
+    enum wm_char_mapping mapping;
     MSG msg = *pmsg;
-    map_wparam_AtoW( msg.message, &msg.wParam, WMCHAR_MAP_NOMAPPING );
+
+    mapping = GetSystemMetrics( SM_DBCSENABLED ) ? WMCHAR_MAP_ISDIALOGMESSAGE : WMCHAR_MAP_NOMAPPING;
+    if (!map_wparam_AtoW( msg.message, &msg.wParam, mapping ))
+        return TRUE;
     return IsDialogMessageW( hwndDlg, &msg );
 }
 

dlls/user32/tests/dialog.c

@@ -575,10 +575,7 @@ static LRESULT CALLBACK test_IsDialogMessageA_proc(HWND hwnd, UINT msg, WPARAM w
     {
     case WM_CHAR:
         if (GetSystemMetrics(SM_DBCSENABLED))
-        {
-            todo_wine
             ok(wparam == 0x5b57, "Got unexpected wparam %#Ix.\n", wparam);
-        }
         else
             ok(wparam == 0x3f, "Got unexpected wparam %#Ix.\n", wparam);
         wm_char_count++;
@@ -879,7 +876,6 @@ static void test_IsDialogMessage(void)
             DispatchMessageA(&msg);
         }
     }
-    todo_wine_if(GetSystemMetrics(SM_DBCSENABLED))
     ok(wm_char_count == 1, "Got unexpected WM_CHAR count %d.\n", wm_char_count);
     DestroyWindow(g_hwndMain);
 }

include/ntuser.h

@@ -135,6 +135,7 @@ enum wm_char_mapping
     WMCHAR_MAP_RECVMESSAGE,
     WMCHAR_MAP_DISPATCHMESSAGE,
     WMCHAR_MAP_CALLWINDOWPROC,
+    WMCHAR_MAP_ISDIALOGMESSAGE,
     WMCHAR_MAP_COUNT,
     WMCHAR_MAP_NOMAPPING = WMCHAR_MAP_COUNT
 };