Fix crash when swapping away from the AsciiGrid.

Fix issue where structs cant be created if they have attributes.
Fix copy/paste crash with multiline string items.
Fix project view missing some file changes.
Fix project view forgetting the expanded status of items.

StructuredXmlEditor/Data/ComplexDataItem.cs

@@ -26,7 +26,7 @@ public abstract class ComplexDataItem : DataItem
 		protected abstract string EmptyString { get; }
 
 		//-----------------------------------------------------------------------
-		public bool HasContent { get { return Children.Count > 0 || Attributes.Count != 0; } }
+		public virtual bool HasContent { get { return Children.Count > 0 || Attributes.Count != 0; } }
 
 		//-----------------------------------------------------------------------
 		public override string Description

StructuredXmlEditor/Data/MultilineStringItem.cs

@@ -5,6 +5,7 @@
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
+using System.Windows;
 
 namespace StructuredXmlEditor.Data
 {
@@ -76,5 +77,30 @@ public MultilineStringItem(DataDefinition definition, UndoRedoManager undoRedo)
 		{
 
 		}
+
+		//-----------------------------------------------------------------------
+		public override void ResetToDefault()
+		{
+			Value = (Definition as MultilineStringDefinition).Default;
+		}
+
+		//-----------------------------------------------------------------------
+		public override void Copy()
+		{
+			var asString = Value;
+
+			Clipboard.SetData(CopyKey, asString);
+		}
+
+		//-----------------------------------------------------------------------
+		public override void Paste()
+		{
+			if (Clipboard.ContainsData(CopyKey))
+			{
+				var asString = Clipboard.GetData(CopyKey) as string;
+
+				Value = asString;
+			}
+		}
 	}
 }

StructuredXmlEditor/Data/StructItem.cs

@@ -26,6 +26,9 @@ public class StructItem : ComplexDataItem
 		//-----------------------------------------------------------------------
 		protected override string EmptyString { get { return "null"; } }
 
+		//-----------------------------------------------------------------------
+		public override bool HasContent { get { return Children.Count == (Definition as StructDefinition).Children.Count; } }
+
 		//-----------------------------------------------------------------------
 		public StructItem(DataDefinition definition, UndoRedoManager undoRedo) : base(definition, undoRedo)
 		{

StructuredXmlEditor/Data/Workspace.cs

@@ -243,6 +243,8 @@ public void SetupFileChangeHandlers()
 						Open(path);
 					}
 				}
+
+				ProjectViewTool.Instance.Add(path);
 			};
 
 			FileCreated += (path) =>

StructuredXmlEditor/Tools/ProjectView/ProjectItem.cs

@@ -48,19 +48,18 @@ public IEnumerable<ProjectItem> Items
 
 		public bool IsExpanded
 		{
-			get { return m_isExpanded; }
+			get { return Tool.ExpansionMap[Path]; }
 			set
 			{
-				if (m_isExpanded != value)
+				if (IsExpanded != value)
 				{
-					m_isExpanded = value;
+					Tool.ExpansionMap[Path] = value;
 
 					RaisePropertyChangedEvent("IsExpanded");
 					Tool.DeferredRefresh();
 				}
 			}
 		}
-		private bool m_isExpanded = false;
 
 		//-----------------------------------------------------------------------
 		public Command<object> ExpandAllCMD { get { return new Command<object>((e) => Tool.Root.SetExpand(true)); } }
@@ -74,6 +73,11 @@ public ProjectItem(Workspace workspace, ProjectItem parent, ProjectViewTool tool
 			this.Tool = tool;
 			this.Name = name;
 
+			if (!tool.ExpansionMap.ContainsKey(Path))
+			{
+				tool.ExpansionMap[Path] = false;
+			}
+
 			if (!skipLoadAndAdd)
 			{
 				if (IsDirectory)

StructuredXmlEditor/Tools/ProjectView/ProjectViewTool.cs

@@ -13,6 +13,9 @@ namespace StructuredXmlEditor.Tools
 {
 	public class ProjectViewTool : ToolBase
 	{
+		//-----------------------------------------------------------------------
+		public Dictionary<string, bool> ExpansionMap { get; } = new Dictionary<string, bool>();
+
 		//-----------------------------------------------------------------------
 		public static ProjectViewTool Instance;
 
@@ -160,8 +163,19 @@ public void Add(string path)
 			{
 				if (part == parts.Last())
 				{
-					new ProjectItem(Workspace, current, this, part);
-					current.UpdateChildFolders();
+					if (ext != String.Empty)
+					{
+						new ProjectItem(Workspace, current, this, part);
+						current.UpdateChildFolders();
+					}
+					else
+					{
+						var folder = current.ChildFolders[part];
+						current.Children.Remove(folder);
+
+						new ProjectItem(Workspace, current, this, part);
+						current.UpdateChildFolders();
+					}
 				}
 				else
 				{

StructuredXmlEditor/View/CustomControls/AsciiGrid.cs

@@ -588,6 +588,8 @@ private void OnPropertyChange(object sender, PropertyChangedEventArgs args)
 		//-----------------------------------------------------------------------
 		protected override void OnRender(DrawingContext drawingContext)
 		{
+			if (Item == null) return;
+
 			if (selectionBackBrush == null)
 			{
 				selectionBackBrush = new SolidColorBrush(Color.FromScRgb(0.1f, SelectedColour.ScR, SelectedColour.ScG, SelectedColour.ScB));