1. wxListBox::Delete() refresh bug fixed

2. wxScrollBar::HitTest() fixed (=> fixing refresh problem) for scrollbars
   without range


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/wxUNIVERSAL@8500 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/listbox/lboxtest.cpp

@@ -226,6 +226,7 @@ bool LboxTestApp::OnInit()
     frame->Show();
 
     //wxLog::AddTraceMask(_T("listbox"));
+    wxLog::AddTraceMask(_T("scrollbar"));
 
     return TRUE;
 }