Fixed forum-18448: crash when editing XML file containing a reference to a non-existing DTD.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@2665 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/AddIns/DisplayBindings/XmlEditor/Project/Src/XmlParser.cs

@@ -139,7 +139,7 @@ namespace ICSharpCode.XmlEditor
 			try {
 				StringReader reader = new StringReader(xml);
 				XmlTextReader xmlReader = new XmlTextReader(reader);
-				xmlReader.XmlResolver = null;
+				xmlReader.XmlResolver = null; // prevent XmlTextReader from loading external DTDs
 				while (xmlReader.Read()) {
 					switch (xmlReader.NodeType) {
 						case XmlNodeType.Element:
@@ -155,8 +155,6 @@ namespace ICSharpCode.XmlEditor
 				}
 			} catch (XmlException) { 
 				// Do nothing.
-			} catch (WebException) {
-				// Do nothing.
 			}
 			
 			path.Compact();

src/AddIns/Misc/SearchAndReplace/Project/Engine/TextIterator/ForwardTextIterator.cs

@@ -60,7 +60,9 @@ namespace SearchAndReplace
 		
 		public ForwardTextIterator(ProvidedDocumentInformation info)
 		{
-			Debug.Assert(info != null);
+			if (info == null)
+				throw new ArgumentNullException("info");
+			
 			this.info       = info;
 			this.textBuffer = info.TextBuffer;
 			this.position   = info.CurrentOffset;

src/Main/Base/Project/Src/TextEditor/XmlFormattingStrategy.cs

@@ -116,6 +116,7 @@ namespace ICSharpCode.SharpDevelop.DefaultEditor
 			// TextReader line number begin with 1, #dev line numbers with 0
 			using (StringReader stringReader = new StringReader(document.TextContent)) {
 				XmlTextReader r = new XmlTextReader(stringReader);
+				r.XmlResolver = null; // prevent XmlTextReader from loading external DTDs
 				while (r.Read()) {
 					if (wasEmptyElement) {
 						wasEmptyElement = false;