[PATCH 0/1] MR5743: user32/tests: Add a test to show that SendMessage(LB_SETCOUNT) adds a scrollbar.

[Dmitry Timoshkov (＠dmitry)]

In addition to existing tests this shows that the call
SendMessage(listbox, LB_SETCOUNT, 100, 0);
adds a scrollbar to the listbox however it doesn't add a nonclient area to
an update region because the call
ValidateRect(listbox, NULL);
validates a client area, and after that a window no longer has an update region.