Fixes #4046 - Moves examples into ./Examples and fixes ./Tests (#4047)

* touching publish.yml

* Moved Examples into ./Examples

* Moved Benchmarks into ./Tests

* Moved Benchmarks into ./Tests

* Moved UICatalog into ./Examples

* Moved UICatalog into ./Examples 2

* Moved tests into ./Tests

* Updated nuget

Examples/UICatalog/Scenarios/InteractiveTree.cs

@@ -0,0 +1,166 @@
+using System.Linq;
+using Terminal.Gui;
+
+namespace UICatalog.Scenarios;
+
+[ScenarioMetadata ("Interactive Tree", "Create nodes and child nodes in TreeView.")]
+[ScenarioCategory ("Controls")]
+[ScenarioCategory ("TreeView")]
+public class InteractiveTree : Scenario
+{
+    private TreeView _treeView;
+
+    public override void Main ()
+    {
+        Application.Init ();
+        var appWindow = new Toplevel ()
+        {
+            Title = GetName (),
+        };
+
+        var menu = new MenuBar
+        {
+            Menus =
+            [
+                new ("_File", new MenuItem [] { new ("_Quit", "", Quit) })
+            ]
+        };
+        appWindow.Add (menu);
+
+        _treeView = new ()
+        {
+            X = 0,
+            Y = 1,
+            Width = Dim.Fill (),
+            Height = Dim.Fill (1)
+        };
+        _treeView.KeyDown += TreeView_KeyPress;
+
+        appWindow.Add (_treeView);
+
+        var statusBar = new StatusBar (
+                                       new Shortcut []
+                                       {
+                                           new (Application.QuitKey, "Quit", Quit),
+                                           new (Key.C.WithCtrl, "Add Child", AddChildNode),
+                                           new (Key.T.WithCtrl, "Add Root", AddRootNode),
+                                           new (Key.R.WithCtrl, "Rename Node", RenameNode)
+                                       }
+                                      );
+        appWindow.Add (statusBar);
+
+        Application.Run (appWindow);
+        appWindow.Dispose ();
+        Application.Shutdown ();
+    }
+
+    private void AddChildNode ()
+    {
+        ITreeNode node = _treeView.SelectedObject;
+
+        if (node != null)
+        {
+            if (GetText ("Text", "Enter text for node:", "", out string entered))
+            {
+                node.Children.Add (new TreeNode (entered));
+                _treeView.RefreshObject (node);
+            }
+        }
+    }
+
+    private void AddRootNode ()
+    {
+        if (GetText ("Text", "Enter text for node:", "", out string entered))
+        {
+            _treeView.AddObject (new TreeNode (entered));
+        }
+    }
+
+    private bool GetText (string title, string label, string initialText, out string enteredText)
+    {
+        var okPressed = false;
+
+        var ok = new Button { Text = "Ok", IsDefault = true };
+
+        ok.Accepting += (s, e) =>
+                     {
+                         okPressed = true;
+                         Application.RequestStop ();
+                     };
+        var cancel = new Button { Text = "Cancel" };
+        cancel.Accepting += (s, e) => Application.RequestStop ();
+        var d = new Dialog { Title = title, Buttons = [ok, cancel] };
+
+        var lbl = new Label { X = 0, Y = 1, Text = label };
+
+        var tf = new TextField { Text = initialText, X = 0, Y = 2, Width = Dim.Fill () };
+
+        d.Add (lbl, tf);
+        tf.SetFocus ();
+
+        Application.Run (d);
+        d.Dispose ();
+
+        enteredText = okPressed ? tf.Text : null;
+
+        return okPressed;
+    }
+
+    private void Quit () { Application.RequestStop (); }
+
+    private void RenameNode ()
+    {
+        ITreeNode node = _treeView.SelectedObject;
+
+        if (node != null)
+        {
+            if (GetText ("Text", "Enter text for node:", node.Text, out string entered))
+            {
+                node.Text = entered;
+                _treeView.RefreshObject (node);
+            }
+        }
+    }
+
+    private void TreeView_KeyPress (object sender, Key obj)
+    {
+        if (obj.KeyCode == Key.Delete)
+        {
+            ITreeNode toDelete = _treeView.SelectedObject;
+
+            if (toDelete == null)
+            {
+                return;
+            }
+
+            obj.Handled = true;
+
+            // if it is a root object remove it
+            if (_treeView.Objects.Contains (toDelete))
+            {
+                _treeView.Remove (toDelete);
+            }
+            else
+            {
+                ITreeNode parent = _treeView.GetParent (toDelete);
+
+                if (parent == null)
+                {
+                    MessageBox.ErrorQuery (
+                                           "Could not delete",
+                                           $"Parent of '{toDelete}' was unexpectedly null",
+                                           "Ok"
+                                          );
+                }
+                else
+                {
+                    //update the model
+                    parent.Children.Remove (toDelete);
+
+                    //refresh the tree
+                    _treeView.RefreshObject (parent);
+                }
+            }
+        }
+    }
+}