ChangeMarkerMargin: optimized refresh performance on load and save

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

@@ -47,7 +47,7 @@ namespace ICSharpCode.AvalonEdit.AddIn
 								drawingContext.DrawRectangle(Brushes.LightGreen, null, rect);
 								break;
 							case ChangeType.Modified:
-								drawingContext.DrawRectangle(Brushes.Blue, null, rect);
+								drawingContext.DrawRectangle(Brushes.LightBlue, null, rect);
 								break;
 							case ChangeType.Unsaved:
 								drawingContext.DrawRectangle(Brushes.Yellow, null, rect);

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

@@ -24,6 +24,7 @@ namespace ICSharpCode.AvalonEdit.AddIn
 		CompressingTreeList<LineChangeInfo> changeList;
 		IDocument document;
 		TextDocument textDocument;
+		IDocument baseDocument;
 		
 		public event EventHandler ChangeOccurred;
 		
@@ -51,44 +52,69 @@ namespace ICSharpCode.AvalonEdit.AddIn
 			this.textDocument = ((TextView)document.GetService(typeof(TextView))).Document;
 			this.changeList = new CompressingTreeList<LineChangeInfo>((x, y) => x.Equals(y));
 			
-			SetupInitialFileState();
+			Stream baseFileStream = GetBaseVersion();
+			
+			if (baseFileStream != null)
+				baseDocument = DocumentUtilitites.LoadReadOnlyDocumentFromBuffer(new StringTextBuffer(ReadAll(baseFileStream)));
+			
+			SetupInitialFileState(false);
 			
 			lineTracker = WeakLineTracker.Register(this.textDocument, this);
 			this.textDocument.UndoStack.PropertyChanged += UndoStackPropertyChanged;
 		}
 		
-		void SetupInitialFileState()
+		LineChangeInfo TransformLineChangeInfo(LineChangeInfo info)
 		{
-			changeList.Clear();
+			if (info.Change == ChangeType.Unsaved)
+				info.Change = ChangeType.Added;
 			
-			Stream baseFileStream = GetBaseVersion();
-			string baseFile = ReadAll(baseFileStream);
-			
-			MyersDiff.MyersDiff diff = new MyersDiff.MyersDiff(
-				new StringSequence(baseFile),
-				new StringSequence(textDocument.Text)
-			);
-			
-			if (diff == null)
-				changeList.InsertRange(0, document.TotalNumberOfLines + 1, new LineChangeInfo(ChangeType.None, ""));
-			else {
+			return info;
+		}
+		
+		void SetupInitialFileState(bool update)
+		{
+			if (baseDocument == null) {
+				if (update)
+					changeList.Transform(TransformLineChangeInfo);
+				else
+					changeList.InsertRange(0, document.TotalNumberOfLines + 1, new LineChangeInfo(ChangeType.None, ""));
+			}else {
+				changeList.Clear();
+				
+				MyersDiff.MyersDiff diff = new MyersDiff.MyersDiff(
+					new DocumentSequence(baseDocument),
+					new DocumentSequence(document)
+				);
+				
 				changeList.Add(new LineChangeInfo(ChangeType.None, ""));
 				int lastEndLine = 0;
+				
 				foreach (Edit edit in diff.GetEdits()) {
 					Console.WriteLine(edit);
 					
-					int beginLine = textDocument.GetLineByOffset(edit.BeginB).LineNumber;
-					int endLine = textDocument.GetLineByOffset(edit.EndB).LineNumber;
-					changeList.InsertRange(changeList.Count, beginLine - lastEndLine, new LineChangeInfo(ChangeType.None, ""));
+					int beginLine = edit.BeginB;
+					int endLine = edit.EndB;
+					
+					changeList.InsertRange(changeList.Count, beginLine - lastEndLine, LineChangeInfo.Empty);
+					
 					if (edit.EditType == ChangeType.Deleted) {
 						LineChangeInfo change = changeList[beginLine];
-						change.DeletedLinesAfterThisLine += baseFile.Substring(edit.BeginA, edit.EndA - edit.BeginA);
+						
+						for (int i = edit.BeginA; i < edit.EndA; i++) {
+							var line = baseDocument.GetLine(i + 1);
+							change.DeletedLinesAfterThisLine += line.Text;
+						}
+						
 						changeList[beginLine] = change;
-					} else
-						changeList.InsertRange(changeList.Count, endLine - beginLine, new LineChangeInfo(edit.EditType, ""));
+					} else {
+						var change = new LineChangeInfo(edit.EditType, "");
+						changeList.InsertRange(changeList.Count, endLine - beginLine, change);
+					}
+					
 					lastEndLine = endLine;
 				}
-				changeList.InsertRange(changeList.Count, textDocument.LineCount - lastEndLine, new LineChangeInfo(ChangeType.None, ""));
+				
+				changeList.InsertRange(changeList.Count, textDocument.LineCount - lastEndLine, LineChangeInfo.Empty);
 			}
 			
 			OnChangeOccurred(EventArgs.Empty);
@@ -111,30 +137,18 @@ namespace ICSharpCode.AvalonEdit.AddIn
 					return result;
 			}
 			
-			return new DefaultVersionProvider().OpenBaseVersion(fileName);
+			return null;
 		}
 		
 		void UndoStackPropertyChanged(object sender, PropertyChangedEventArgs e)
 		{
 			if (textDocument.UndoStack.IsOriginalFile)
-				SetupInitialFileState();
+				SetupInitialFileState(true);
 		}
 		
 		void ILineTracker.BeforeRemoveLine(DocumentLine line)
 		{
-			int index = line.LineNumber;
-			LineChangeInfo info = changeList[index];
-			LineChangeInfo lineBefore = changeList[index - 1];
-			
-			// TODO : add deleted text (GetText not allowed in ILineTracker callbacks)
-//			lineBefore.DeletedLinesAfterThisLine
-//				+= (textDocument.GetText(line.Offset, line.Length)
-//				    + Environment.NewLine + info.DeletedLinesAfterThisLine);
-//
-//			Debug.Assert(lineBefore.DeletedLinesAfterThisLine.EndsWith(Environment.NewLine));
-			
-			changeList[index - 1] = lineBefore;
-			changeList.RemoveAt(index);
+			changeList.RemoveAt(line.LineNumber);
 		}
 		
 		void ILineTracker.SetLineLength(DocumentLine line, int newTotalLength)
@@ -160,6 +174,8 @@ namespace ICSharpCode.AvalonEdit.AddIn
 		
 		void ILineTracker.RebuildDocument()
 		{
+			changeList.Clear();
+			changeList.InsertRange(0, document.TotalNumberOfLines + 1, new LineChangeInfo(ChangeType.Unsaved, ""));
 		}
 		
 		bool disposed = false;

src/AddIns/VersionControl/GitAddIn/Src/GitVersionProvider.cs

@@ -87,13 +87,20 @@ namespace ICSharpCode.GitAddIn
 			runner.Start("cmd", "/c git ls-tree HEAD " + Path.GetFileName(fileName));
 			runner.WaitForExit();
 			
-			return runner.StandardOutput
-				.Trim()
-				.Split(new[] { " ", "\t" }, StringSplitOptions.RemoveEmptyEntries)[2];
+			string output = runner.StandardOutput.Trim();
+			string[] parts = output.Split(new[] { " ", "\t" }, StringSplitOptions.RemoveEmptyEntries);
+			
+			if (parts.Length < 3)
+				return null;
+			
+			return parts[2];
 		}
 		
 		Stream OpenOutput(string fileName, string blobHash)
 		{
+			if (blobHash == null)
+				return null;
+			
 			AnonymousPipeServerStream pipe = new AnonymousPipeServerStream(PipeDirection.In, HandleInheritability.Inheritable);
 			
 			StartupInfo startupInfo = new GitVersionProvider.StartupInfo();

src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Utils/CompressingTreeList.cs

@@ -353,6 +353,26 @@ namespace ICSharpCode.AvalonEdit.Utils
 			return GetNode(ref index).count - index;
 		}
 		
+		/// <summary>
+		/// Applies the conversion function to all elements in this CompressingTreeList.
+		/// </summary>
+		public void Transform(Func<T, T> converter)
+		{
+			if (root == null)
+				return;
+			Node prevNode = null;
+			for (Node n = root.LeftMost; n != null; n = n.Successor) {
+				n.value = converter(n.value);
+				if (prevNode != null && comparisonFunc(prevNode.value, n.value)) {
+					n.count += prevNode.count;
+					UpdateAugmentedData(n);
+					RemoveNode(prevNode);
+				}
+				prevNode = n;
+			}
+		}
+
+		
 		/// <summary>
 		/// Inserts the specified <paramref name="item"/> at <paramref name="index"/>
 		/// </summary>

src/Main/Base/Project/Src/Editor/IDocumentBaseVersionProvider.cs

@@ -64,6 +64,8 @@ namespace ICSharpCode.SharpDevelop.Editor
 	
 	public struct LineChangeInfo : IEquatable<LineChangeInfo>
 	{
+		public static readonly LineChangeInfo Empty = new LineChangeInfo(ChangeType.None, "");
+		
 		ChangeType change;
 		
 		public ChangeType Change {