Apply recent navigation fixes only where needed on Mac...

src/widgets/wxPanelWrapper.cpp

@@ -20,6 +20,9 @@ wxPanelWrapper::wxPanelWrapper(wxWindow * parent, wxWindowID id,
 
 void wxPanelWrapper::DoCharHook(wxKeyEvent &event)
 {
+#ifdef __WXMAC
+   // Compensate for the regressions in TAB key navigation
+   // due to the switch to wxWidgets 3.0.2
    if (event.GetKeyCode() == WXK_TAB) {
       wxWindow::FindFocus()->Navigate(
          event.ShiftDown()
@@ -28,6 +31,7 @@ void wxPanelWrapper::DoCharHook(wxKeyEvent &event)
       );
       return;
    }
+#endif
 
    event.Skip();
 }