keyboard/focus handling improved a bit more:

1. wxFrame doesn't give focus to anything at all on activation
2. last control restored more often (some problems still persist)
3. buttons process enter
4. text controls with wxTE_PROCESS_TAB still leave TAB work as dialog
   navigation key if the event wasn't processed


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@2842 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/wincmn.cpp

@@ -191,6 +191,16 @@ wxWindowBase::~wxWindowBase()
 
     wxASSERT_MSG( GetChildren().GetCount() == 0, _T("children not destroyed") );
 
+    // make sure that there are no dangling pointers left pointing to us
+    wxPanel *panel = wxDynamicCast(GetParent(), wxPanel);
+    if ( panel )
+    {
+        if ( panel->GetLastFocus() == this )
+        {
+            panel->SetLastFocus((wxWindow *)NULL);
+        }
+    }
+
 #if wxUSE_CARET
     if ( m_caret )
         delete m_caret;