Make generic wxDataViewToggleRenderer react to activation.

Previously it only responded to single-clicks, which was to avoid the
need to double-click checkboxes. Fixed to react to activation via
double-click or keyboard too.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@68953 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/dvrenderers.h

@@ -126,6 +126,11 @@ public:
                                wxDataViewModel *model,
                                const wxDataViewItem& item,
                                unsigned int col);
+
+    virtual bool WXOnActivate(const wxRect& cell,
+                              wxDataViewModel *model,
+                              const wxDataViewItem& item,
+                              unsigned int col);
 private:
     bool    m_toggle;