user32: Invalidate the listbox in LB_SETCOUNT.

[Huw Davies]

---
 dlls/user32/listbox.c       |  2 ++
 dlls/user32/tests/listbox.c | 78 ++++++++++++++++++++++++++++++++++++---------
 2 files changed, 65 insertions(+), 15 deletions(-)

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