Reapplied patch to change the two scrolled window implementations

to no longer clip the last bits as a rounding error. I had to
    change GetVirtualSize() as per my mail to devs.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@31976 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/wincmn.cpp

@@ -789,10 +789,10 @@ void wxWindowBase::DoSetVirtualSize( int x, int y )
 
 wxSize wxWindowBase::DoGetVirtualSize() const
 {
-    wxSize  s( GetClientSize() );
+    if (m_virtualSize == wxDefaultSize)
+        return GetClientSize();
 
-    return wxSize( wxMax( m_virtualSize.GetWidth(), s.GetWidth() ),
-                   wxMax( m_virtualSize.GetHeight(), s.GetHeight() ) );
+    return m_virtualSize;
 }
 
 // ----------------------------------------------------------------------------