Minor performance improvement for AvalonEdit (e.g. when indenting all lines in the file).

src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Document/OffsetChangeMap.cs

@@ -110,8 +110,10 @@ namespace ICSharpCode.AvalonEdit.Document
 		/// </summary>
 		public int GetNewOffset(int offset, AnchorMovementType movementType)
 		{
-			foreach (OffsetChangeMapEntry entry in this) {
-				offset = entry.GetNewOffset(offset, movementType);
+			IList<OffsetChangeMapEntry> items = this.Items;
+			int count = items.Count;
+			for (int i = 0; i < count; i++) {
+				offset = items[i].GetNewOffset(offset, movementType);
 			}
 			return offset;
 		}

src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Editing/Caret.cs

@@ -86,6 +86,15 @@ namespace ICSharpCode.AvalonEdit.Editing
 			}
 		}
 		
+		/// <summary>
+		/// Gets the caret position without validating it.
+		/// </summary>
+		internal TextViewPosition NonValidatedPosition {
+			get {
+				return position;
+			}
+		}
+		
 		/// <summary>
 		/// Gets/Sets the location of the caret.
 		/// The getter of this property is faster than <see cref="Position"/> because it doesn't have

src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Editing/TextArea.cs

@@ -320,7 +320,9 @@ namespace ICSharpCode.AvalonEdit.Editing
 			public RestoreCaretAndSelectionUndoAction(TextArea textArea)
 			{
 				this.textAreaReference = new WeakReference(textArea);
-				this.caretPosition = textArea.Caret.Position;
+				// Just save the old caret position, no need to validate here.
+				// If we restore it, we'll validate it anyways.
+				this.caretPosition = textArea.Caret.NonValidatedPosition;
 				this.selection = textArea.Selection;
 			}
 			
@@ -379,7 +381,7 @@ namespace ICSharpCode.AvalonEdit.Editing
 				if (value == null)
 					throw new ArgumentNullException("value");
 				if (!object.Equals(selection, value)) {
-					Debug.WriteLine("Selection change from " + selection + " to " + value);
+					//Debug.WriteLine("Selection change from " + selection + " to " + value);
 					if (textView != null) {
 						ISegment oldSegment = selection.SurroundingSegment;
 						ISegment newSegment = value.SurroundingSegment;