[fix:] adding ".md" if not added by user (wiki)

Reviewed-on: #33

MainWindow.axaml.cs

@@ -991,6 +991,10 @@ public partial class MainWindow : Window
     private async void BtnWikiAddFile_OnClick(object? sender, RoutedEventArgs e)
     {
         var result = await NamingWindow.Show(this);
+        if (!result.EndsWith(".md")) result += ".md";
+        if (!Directory.Exists(Global._instance.wiki_storage_path))
+            Directory.CreateDirectory(Global._instance.wiki_storage_path);
+        
         if (result != null)
             try
             {

Tasks/CombineAddresses.cs

@@ -37,7 +37,8 @@ public class CombineAddresses
     /// <returns></returns>
     public bool CompareAddresses(KasPerson first, KasPerson second, bool only_refsid = false)
     {
-        if (first.refsid == second.refsid) return true;
+        // A refsid of 0 means "missing", so it must not collapse unrelated entries.
+        if (first.refsid != 0 && second.refsid != 0 && first.refsid == second.refsid) return true;
         if (!only_refsid)
             if (first.name == second.name &&
                 first.anrede == second.anrede &&