comctl32/tests: Flush events before testing edit control SetFocus() messages.

dlls/comctl32/tests/edit.c

@@ -54,6 +54,24 @@ struct edit_notify {
 
 static struct edit_notify notifications;
 
+/* try to make sure pending X events have been processed before continuing */
+static void flush_events(void)
+{
+    MSG 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 (PeekMessageA(&msg, 0, 0, 0, PM_REMOVE))
+            DispatchMessageA(&msg);
+        diff = time - GetTickCount();
+    }
+}
+
 static INT_PTR CALLBACK multi_edit_dialog_proc(HWND hdlg, UINT msg, WPARAM wparam, LPARAM lparam)
 {
     static int num_ok_commands = 0;
@@ -3445,6 +3463,7 @@ static void test_change_focus(void)
     SetWindowLongPtrA(hwnd, GWLP_USERDATA, (LONG_PTR)oldproc);
 
     SetCursorPos(400, 400);
+    flush_events();
 
     SetFocus(parent_wnd);
     flush_sequences(sequences, NUM_MSG_SEQUENCES);