Need to call wxVScrolledWindow::UpdateScrollbar() in wxVListBox EVT_SIZE handler. Otherwise resizing wxVListBox does not update visible items count.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@56090 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/vlbox.h

@@ -243,6 +243,7 @@ protected:
     void OnLeftDown(wxMouseEvent& event);
     void OnLeftDClick(wxMouseEvent& event);
     void OnSetOrKillFocus(wxFocusEvent& event);
+    void OnSize(wxSizeEvent& event);
 
     // common part of all ctors
     void Init();