Use live update for splitter on Mac since Leopard seems even more susceptible to screen drawing crashes

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@60888 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/html/helpwnd.cpp

@@ -363,7 +363,12 @@ bool wxHtmlHelpWindow::Create(wxWindow* parent, wxWindowID id,
     {
         // traditional help controller; splitter window with html page on the
         // right and a notebook containing various pages on the left
-        m_Splitter = new wxSplitterWindow(this);
+        long splitterStyle = wxSP_3D;
+        // Drawing moving sash can cause problems on wxMac
+#ifdef __WXMAC__
+        splitterStyle |= wxSP_LIVE_UPDATE;
+#endif
+        m_Splitter = new wxSplitterWindow(this, wxID_ANY, wxDefaultPosition, wxDefaultSize, splitterStyle);
 
         topWindowSizer->Add(m_Splitter, 1, wxEXPAND);