need to AdjustScrollbars() after changing the virtual size in CalcDimensions()

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@55628 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/grid.cpp

@@ -4688,10 +4688,11 @@ void wxGrid::CalcDimensions()
     if ( y >= h )
         y = wxMax( h - 1, 0 );
 
-    // do set scrollbar parameters
+    // update the virtual size and refresh the scrollbars to reflect it
     SetScrollRate(m_scrollLineX, m_scrollLineY);
     m_gridWin->SetVirtualSize(w, h);
     Scroll(x, y);
+    AdjustScrollbars();
 
     // if our OnSize() hadn't been called (it would if we have scrollbars), we
     // still must reposition the children