GetMessage: Return -1 if an invalid window handle has been passed

[Michael Kaufmann]

Changelog:
GetMessage: Return -1 if an invalid window handle has been passed
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Index: dlls/user/message.c
===================================================================
RCS file: /home/wine/wine/dlls/user/message.c,v
retrieving revision 1.113
diff -u -r1.113 message.c
--- dlls/user/message.c	14 Jun 2006 11:55:12 -0000	1.113
+++ dlls/user/message.c	21 Jun 2006 09:41:21 -0000
@@ -2813,6 +2813,11 @@
         unsigned int wake_bits = 0, changed_bits = 0;
         DWORD dwlc;
 
+        if (hwnd && !IsWindow(hwnd))
+        {
+            return -1;
+        }
+
         SERVER_START_REQ( set_queue_mask )
         {
             req->wake_mask    = QS_SENDMESSAGE;
@@ -2846,9 +2851,9 @@
  */
 BOOL WINAPI GetMessageA( MSG *msg, HWND hwnd, UINT first, UINT last )
 {
-    GetMessageW( msg, hwnd, first, last );
+    BOOL ret = GetMessageW( msg, hwnd, first, last );
     msg->wParam = map_wparam_WtoA( msg->message, msg->wParam );
-    return (msg->message != WM_QUIT);
+    return ret;
 }