msctf/tests: Give time for the messages to arrive.

dlls/msctf/tests/inputprocessor.c

@@ -1993,9 +1993,20 @@ static void test_Compartments(void)
 static void processPendingMessages(void)
 {
     MSG msg;
-    while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
-        TranslateMessage(&msg);
-        DispatchMessage(&msg);
+    int diff = 200;
+    int min_timeout = 100;
+    DWORD time = GetTickCount() + diff;
+
+    while (diff > 0)
+    {
+        if (MsgWaitForMultipleObjects(0, NULL, FALSE, min_timeout, QS_ALLINPUT) == WAIT_TIMEOUT)
+            break;
+        while (PeekMessage(&msg, 0, 0, 0, PM_REMOVE))
+        {
+            TranslateMessage(&msg);
+            DispatchMessage(&msg);
+        }
+        diff = time - GetTickCount();
     }
 }