[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.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/5743