The xml editor now keeps the existing document folds if the xml is no longer well formed.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@1107 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

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

@@ -136,7 +136,8 @@ namespace ICSharpCode.XmlEditor
 				}
 			} catch (Exception) {
 				// If the xml is not well formed keep the foldings 
-				// we found.
+				// that already exist in the document.
+				return document.FoldingManager.FoldMarker;
 			}
 
 			return foldMarkers;