Windows: Add MailLogWindow

Elwig/Windows/LogWindow.xaml.cs

@@ -36,9 +36,10 @@ namespace Elwig.Windows {
         }
 
         private void EventList_SelectionChanged(object sender, RoutedEventArgs evt) {
-            var t = EventList.SelectedItem.GetType();
+            var item = EventList.SelectedItem;
+            var t = item.GetType();
             var p = t.GetProperty("Event")!;
-            EventData.Text = ((EventLogEntry)p.GetValue(EventList.SelectedItem)!).Message;
+            EventData.Text = ((EventLogEntry)p.GetValue(item)!).Message;
         }
     }
 }