Window activation cleanups.

diff --git a/windows/message.c b/windows/message.c
index a9e5c39..8743e7b 100644
--- a/windows/message.c
+++ b/windows/message.c
@@ -517,6 +517,7 @@
                 eatMsg = TRUE;
                 /* fall through */
             case MA_ACTIVATE:
+            case 0:
                 if (hwndTop != GetForegroundWindow() )
                 {
                     if (!WINPOS_SetActiveWindow( hwndTop, TRUE , TRUE ))