comctl32/tests: Don't crash on some win9x boxes.

dlls/comctl32/tests/header.c

@@ -1034,6 +1034,10 @@ static void test_hdm_filterMessages(HWND hParent)
     else
          ok_sequence(sequences, HEADER_SEQ_INDEX, filterMessages_seq_noninteractive,
                      "filterMessages sequence testing", FALSE);
+    /* Some Win9x versions don't send a WM_KILLFOCUS.
+     * Set the focus explicitly to the parent to avoid a crash.
+     */
+    SetFocus(hParent);
     DestroyWindow(hChild);
 
 }