Added tooltip for ChangeMarkerMargin

src/AddIns/DisplayBindings/AvalonEdit.AddIn/Src/ChangeMarkerMargin.cs

@@ -4,11 +4,12 @@
 using System;
 using System.Collections.Generic;
 using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Input;
 using System.Windows.Media;
+
 using ICSharpCode.AvalonEdit.Editing;
 using ICSharpCode.AvalonEdit.Rendering;
-using ICSharpCode.SharpDevelop;
-using ICSharpCode.SharpDevelop.Editor;
 
 namespace ICSharpCode.AvalonEdit.AddIn
 {
@@ -130,5 +131,63 @@ namespace ICSharpCode.AvalonEdit.AddIn
 		{
 			return new Size(5, 0);
 		}
+		
+		#region Diffs tooltip
+		
+		ToolTip tooltip = new ToolTip();
+		
+		protected override void OnMouseEnter(MouseEventArgs e)
+		{
+			var diffs = changeWatcher.GetDiffsByLine(GetLineFromMousePosition(e));
+			
+			if (diffs != null && diffs.Count > 0) {
+				StackPanel stack = new StackPanel() {
+					Background = Brushes.White
+				};
+				TextBlock oldTb = new TextBlock() {
+					FontFamily = new FontFamily("Courier New"),
+					Foreground = Brushes.Black,
+					Background = Brushes.White,
+					TextDecorations = TextDecorations.Strikethrough,
+				};
+				
+				if (diffs[0] != null)
+					oldTb.Text = diffs[0].Text;
+				
+				TextBlock newTb = new TextBlock() {
+					FontFamily = new FontFamily("Courier New"),
+					Foreground = Brushes.Black,
+					Background = Brushes.White,
+					Text = diffs[1].Text
+				};
+				
+				stack.Children.Add(oldTb);
+				stack.Children.Add(newTb);
+				tooltip.Content = stack;
+				tooltip.Background = Brushes.White;
+				tooltip.IsOpen = true;
+			}
+			
+			base.OnMouseEnter(e);
+		}
+		
+		protected override void OnMouseLeave(MouseEventArgs e)
+		{
+			tooltip.IsOpen = false;
+			base.OnMouseLeave(e);
+		}
+		
+		int GetLineFromMousePosition(MouseEventArgs e)
+		{
+			TextView textView = this.TextView;
+			if (textView == null)
+				return 0;
+			VisualLine vl = textView.GetVisualLineFromVisualTop(e.GetPosition(textView).Y + textView.ScrollOffset.Y);
+			if (vl == null)
+				return 0;
+			return vl.FirstDocumentLine.LineNumber;
+		}
+		
+		#endregion
 	}
 }

src/AddIns/DisplayBindings/AvalonEdit.AddIn/Src/DefaultChangeWatcher.cs

@@ -4,17 +4,15 @@
 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
-using System.Diagnostics;
 using System.IO;
 using System.Linq;
-using System.Text;
 
 using ICSharpCode.AvalonEdit.AddIn.MyersDiff;
 using ICSharpCode.AvalonEdit.Document;
-using ICSharpCode.AvalonEdit.Rendering;
 using ICSharpCode.AvalonEdit.Utils;
 using ICSharpCode.SharpDevelop;
 using ICSharpCode.SharpDevelop.Editor;
+using ICSharpCode.SharpDevelop.Editor.AvalonEdit;
 
 namespace ICSharpCode.AvalonEdit.AddIn
 {
@@ -54,6 +52,12 @@ namespace ICSharpCode.AvalonEdit.AddIn
 			if (baseFileStream != null) {
 				// ReadAll() is taking care of closing the stream
 				baseDocument = DocumentUtilitites.LoadReadOnlyDocumentFromBuffer(new StringTextBuffer(ReadAll(baseFileStream)));
+			} else {
+				if (baseDocument == null) {
+					// if the file is not under subversion, the document is the opened document
+					var doc = new TextDocument(textDocument.Text);
+					baseDocument = new AvalonEditDocumentAdapter(doc, null);
+				}
 			}
 			
 			SetupInitialFileState(false);
@@ -187,5 +191,19 @@ namespace ICSharpCode.AvalonEdit.AddIn
 				disposed = true;
 			}
 		}
+		
+		public IList<IDocumentLine> GetDiffsByLine(int line)
+		{
+			var result = new List<IDocumentLine>();
+			
+			if (baseDocument.TotalNumberOfLines < line)
+				result.Add(null);
+			else
+				result.Add(baseDocument.GetLine(line));
+			
+			result.Add(document.GetLine(line));
+			
+			return result;
+		}
 	}
-}
+}

src/AddIns/DisplayBindings/AvalonEdit.AddIn/Src/LineChangeInfo.cs

@@ -2,6 +2,7 @@
 // This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
 
 using System;
+using System.Collections.Generic;
 using ICSharpCode.SharpDevelop.Editor;
 
 namespace ICSharpCode.AvalonEdit.AddIn
@@ -16,6 +17,7 @@ namespace ICSharpCode.AvalonEdit.AddIn
 		/// </summary>
 		LineChangeInfo GetChange(int lineNumber);
 		void Initialize(IDocument document);
+		IList<IDocumentLine> GetDiffsByLine(int line);
 	}
 	
 	public enum ChangeType