expose IsValidXmlName-API in AXmlParser (useful for XAML rename)

src/Libraries/NRefactory/ICSharpCode.NRefactory.Xml/AXmlParser.cs

@@ -133,5 +133,15 @@ namespace ICSharpCode.NRefactory.Xml
 			var heuristic = new TagMatchingHeuristics(newTextSource);
 			return new AXmlDocument(null, 0, heuristic.CreateDocument(internalObjects, cancellationToken));
 		}
+		
+		/// <summary>
+		/// Checks whether the given name is a valid XML name.
+		/// </summary>
+		public static bool IsValidXmlName(string name)
+		{
+			if (string.IsNullOrWhiteSpace(name))
+				throw new ArgumentException("The XML name cannot be null, empty or consist solely of white space", "name");
+			return TagReader.IsValidName(name);
+		}
 	}
 }

src/Libraries/NRefactory/ICSharpCode.NRefactory.Xml/TagReader.cs

@@ -822,7 +822,7 @@ namespace ICSharpCode.NRefactory.Xml
 		#endregion
 		
 		#region Helper functions
-		static bool IsValidName(string name)
+		internal static bool IsValidName(string name)
 		{
 			try {
 				System.Xml.XmlConvert.VerifyName(name);

src/Main/Base/Project/Src/Gui/Pads/DefinitionViewPad.cs

@@ -123,9 +123,8 @@ namespace ICSharpCode.SharpDevelop.Gui
 		{
 			if (pos.Equals(oldPosition)) return;
 			oldPosition = pos;
-			var fileName = new FileName(pos.FileName);
+			if (pos.FileName != currentFileName)
-			if (fileName != currentFileName)
+				LoadFile(new FileName(pos.FileName));
-				LoadFile(fileName);
 			ctl.TextArea.Caret.Location = pos.Begin;
 			Rect r = ctl.TextArea.Caret.CalculateCaretRectangle();
 			if (!r.IsEmpty) {