Method SetVerticalScrollbar

src/ProjectWindow.cpp:504–510

      if (IsWindowValid(mwWindow)) mwWindow->SetVerticalThumbPosition(viewStart);
   }
   void SetVerticalScrollbar(int position, int thumbSize,
      int range, int pageSize, bool refresh) override
   {
      if (IsWindowValid(mwWindow))
         mwWindow->SetVerticalScrollbar(
           position, thumbSize, range, pageSize, refresh);
   }
   void ShowVerticalScrollbar(bool shown) override
   {
      if (IsWindowValid(mwWindow))