server: Filter WM_QUIT message in PeekMessage call if PM_QS_POSTMESSAGE was not specified.

dlls/user32/tests/msg.c

@@ -10500,6 +10500,10 @@ static void test_quit_message(void)
     flush_events();
     PostQuitMessage(0xbeef);
 
+    msg.message = 0;
+    ret = PeekMessageA(&msg, 0, 0, 0, PM_QS_SENDMESSAGE);
+    ok(!ret, "got %x message\n", msg.message);
+
     ret = PeekMessageA(&msg, NULL, 0, 0, PM_NOREMOVE);
     ok(ret, "PeekMessage failed with error %d\n", GetLastError());
     ok(msg.message == WM_QUIT, "Received message 0x%04x instead of WM_QUIT\n", msg.message);

server/queue.c

@@ -2384,9 +2384,8 @@ DECL_HANDLER(get_message)
         get_posted_message( queue, get_win, WM_HOTKEY, WM_HOTKEY, req->flags, reply ))
         return;
 
-    /* only check for quit messages if not posted messages pending.
-     * note: the quit message isn't filtered */
-    if (get_quit_message( queue, req->flags, reply ))
+    /* only check for quit messages if not posted messages pending */
+    if ((filter & QS_POSTMESSAGE) && get_quit_message( queue, req->flags, reply ))
         return;
 
     /* then check for any raw hardware message */