[chore:] better file- and folder creating

MainWindow.axaml

@@ -327,8 +327,12 @@
                     <Grid ColumnDefinitions="300,*">
                         <Border Grid.Column="0" Background="#FFF" BorderBrush="#DDD" BorderThickness="0,0,1,0">
                             <StackPanel>
-                                <Button Content="+ Hinzufügen" Margin="10" x:Name="BtnWikiAddFile"
+                                <StackPanel Spacing="10" Orientation="Horizontal" Margin="10">
+                                    <Button Content="+ Datei" x:Name="BtnWikiAddFile"
                                             Click="BtnWikiAddFile_OnClick" />
+                                    <Button Content="+ Ordner" x:Name="BtnWikiAddFolder"
+                                            Click="BtnWikiAddFolder_OnClick" />
+                                </StackPanel>
                                 <ScrollViewer HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto">
                                     <TreeView Name="NavTree" Margin="10" />
                                 </ScrollViewer>

MainWindow.axaml.cs

@@ -260,12 +260,20 @@ public partial class MainWindow : Window
         }
     }
 
-    public void PopulateNavTree()
+    public void PopulateNavTree(string? expandToPath = null, string? selectPath = null)
     {
         var roots = _wikiService.GetRootItems();
         var nodes = new List<TreeViewItem>();
         foreach (var r in roots) nodes.Add(BuildNode(r));
         NavTree.ItemsSource = nodes;
+
+        if (!string.IsNullOrWhiteSpace(expandToPath))
+            ExpandAndFindNode(nodes, expandToPath, out _);
+
+        if (!string.IsNullOrWhiteSpace(selectPath) &&
+            ExpandAndFindNode(nodes, selectPath, out var selectedNode) &&
+            selectedNode != null)
+            NavTree.SelectedItem = selectedNode;
     }
 
     private TreeViewItem BuildNode(WikiItem item)
@@ -278,6 +286,63 @@ public partial class MainWindow : Window
         return node;
     }
 
+    private string GetSelectedWikiTargetDirectory()
+    {
+        var wikiRoot = Global._instance.wiki_storage_path;
+        if (NavTree.SelectedItem is TreeViewItem treeItem && treeItem.Tag is WikiItem selectedItem)
+        {
+            if (selectedItem.IsFolder) return selectedItem.Path;
+
+            var parentDir = Path.GetDirectoryName(selectedItem.Path);
+            if (!string.IsNullOrWhiteSpace(parentDir)) return parentDir;
+        }
+
+        return wikiRoot;
+    }
+
+    private static bool PathsEqual(string left, string right)
+    {
+        var normalizedLeft = Path.GetFullPath(left)
+            .TrimEnd(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar);
+        var normalizedRight = Path.GetFullPath(right)
+            .TrimEnd(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar);
+
+        var comparison = OperatingSystem.IsWindows()
+            ? StringComparison.OrdinalIgnoreCase
+            : StringComparison.Ordinal;
+        return string.Equals(normalizedLeft, normalizedRight, comparison);
+    }
+
+    private bool ExpandAndFindNode(IEnumerable<TreeViewItem> nodes, string targetPath, out TreeViewItem? foundNode)
+    {
+        foreach (var node in nodes)
+            if (TryExpandToPath(node, targetPath, out foundNode))
+                return true;
+
+        foundNode = null;
+        return false;
+    }
+
+    private bool TryExpandToPath(TreeViewItem node, string targetPath, out TreeViewItem? foundNode)
+    {
+        if (node.Tag is WikiItem item && PathsEqual(item.Path, targetPath))
+        {
+            foundNode = node;
+            return true;
+        }
+
+        foreach (var childRaw in node.Items)
+            if (childRaw is TreeViewItem childNode &&
+                TryExpandToPath(childNode, targetPath, out foundNode))
+            {
+                node.IsExpanded = true;
+                return true;
+            }
+
+        foundNode = null;
+        return false;
+    }
+
     private void OpenFolderButton_Click(object? sender, RoutedEventArgs e)
     {
         var path = Global._instance.wiki_storage_path;
@@ -991,11 +1056,21 @@ public partial class MainWindow : Window
     private async void BtnWikiAddFile_OnClick(object? sender, RoutedEventArgs e)
     {
         var result = await NamingWindow.Show(this);
-        if (result != null)
+        if (string.IsNullOrWhiteSpace(result)) return;
+
+        result = result.Trim();
+        if (!result.EndsWith(".md", StringComparison.OrdinalIgnoreCase)) result += ".md";
+
+        if (!Directory.Exists(Global._instance.wiki_storage_path))
+            Directory.CreateDirectory(Global._instance.wiki_storage_path);
+
         try
         {
-                File.WriteAllText(Path.Combine(Global._instance.wiki_storage_path, result), "");
+            var targetDirectory = GetSelectedWikiTargetDirectory();
-                PopulateNavTree();
+            Directory.CreateDirectory(targetDirectory);
+            var newFilePath = Path.Combine(targetDirectory, result);
+            File.WriteAllText(newFilePath, "");
+            PopulateNavTree(targetDirectory, newFilePath);
         }
         catch (Exception ex)
         {
@@ -1003,6 +1078,30 @@ public partial class MainWindow : Window
         }
     }
     
+    private async void BtnWikiAddFolder_OnClick(object? sender, RoutedEventArgs e)
+    {
+        var result = await NamingWindow.Show(this);
+        if (string.IsNullOrWhiteSpace(result)) return;
+
+        result = result.Trim();
+        
+        if (!Directory.Exists(Global._instance.wiki_storage_path))
+            Directory.CreateDirectory(Global._instance.wiki_storage_path);
+
+        try
+        {
+            var targetDirectory = GetSelectedWikiTargetDirectory();
+            var newFolderPath = Path.Combine(targetDirectory, result);
+            Directory.CreateDirectory(newFolderPath);
+            PopulateNavTree(targetDirectory, newFolderPath);
+        }
+        catch (Exception ex)
+        {
+            MessageBox.Show(this, ex.StackTrace, "Fehler");
+        }
+    }
+
+
     private async void MnIAdSetRename_OnClick(object? sender, RoutedEventArgs e)
     {
         if (LstCustomerAdressSets.SelectedItems.Count > 0)

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 &&