Fixed a problem in the demo and plugged a potential leak in SetDashes

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@12493 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

wxPython/src/gtk/gdi.cpp

@@ -190,13 +190,16 @@ public:
         { m_dash = NULL; }
     ~wxPyPen() {
         if (m_dash)
-            delete m_dash;
+            delete [] m_dash;
     }
 
     void SetDashes(int nb_dashes, const wxDash *dash) {
+        if (m_dash)
+            delete [] m_dash;
         m_dash = new wxDash[nb_dashes];
-        for (int i=0; i<nb_dashes; i++)
+        for (int i=0; i<nb_dashes; i++) {
             m_dash[i] = dash[i];
+        }
         wxPen::SetDashes(nb_dashes, m_dash);
     }