Add InsertAfter/InsertBefore to AstNodeCollection.

ICSharpCode.NRefactory/CSharp/Ast/AstNodeCollection.cs

@@ -193,5 +193,15 @@ namespace ICSharpCode.NRefactory.CSharp
 			}
 			return false;
 		}
+		
+		public void InsertAfter(T existingItem, T newItem)
+		{
+			node.InsertChildAfter(existingItem, newItem, role);
+		}
+		
+		public void InsertBefore(T existingItem, T newItem)
+		{
+			node.InsertChildBefore(existingItem, newItem, role);
+		}
 	}
 }

ICSharpCode.NRefactory/TypeSystem/CecilLoader.cs

@@ -35,7 +35,7 @@ namespace ICSharpCode.NRefactory.TypeSystem
 		public bool IncludeInternalMembers { get; set; }
 		
 		/// <summary>
-		/// Gets/Sets the documentation provider that is used to retrive the XML documentation for all members.
+		/// Gets/Sets the documentation provider that is used to retrieve the XML documentation for all members.
 		/// </summary>
 		public IDocumentationProvider DocumentationProvider { get; set; }
 		

ICSharpCode.NRefactory/TypeSystem/ITypeResolveContext.cs

@@ -44,7 +44,7 @@ namespace ICSharpCode.NRefactory.TypeSystem
 		/// <param name="nameComparer">Language-specific rules for how namespace names are compared</param>
 		/// <returns>List of classes within that namespace.</returns>
 		/// <remarks>
-		/// If this method is called within <c>using (pc.Synchronize())</c>, then the returned enumerable is valid
+		/// If this method is called within <c>using (var spc = pc.Synchronize())</c>, then the returned enumerable is valid
 		/// only until the end of the synchronize block.
 		/// </remarks>
 		IEnumerable<ITypeDefinition> GetClasses(string nameSpace, StringComparer nameComparer);
@@ -53,7 +53,7 @@ namespace ICSharpCode.NRefactory.TypeSystem
 		/// Retrieves all namespaces.
 		/// </summary>
 		/// <remarks>
-		/// If this method is called within <c>using (pc.Synchronize())</c>, then the returned enumerable is valid
+		/// If this method is called within <c>using (var spc = pc.Synchronize())</c>, then the returned enumerable is valid
 		/// only until the end of the synchronize block.
 		/// </remarks>
 		IEnumerable<string> GetNamespaces();