and more diagnostics

xml/dom-impl/src/com/intellij/util/xml/impl/CollectionChildDescriptionImpl.java

@@ -39,6 +39,11 @@ public class CollectionChildDescriptionImpl extends DomChildDescriptionImpl impl
     myGetterMethods = getterMethods;
   }
 
+  @Override
+  public String toString() {
+    return "CollectionChildDescription:" + getXmlName();
+  }
+
   public NotNullFunction<DomInvocationHandler, List<XmlTag>> getTagsGetter() {
     return myTagsGetter;
   }

xml/dom-impl/src/com/intellij/util/xml/impl/DomInvocationHandler.java

@@ -321,7 +321,7 @@ public abstract class DomInvocationHandler<T extends AbstractDomChildDescription
   }
 
   String toStringEx() {
-    return toString() + "&handler=" + super.toString();
+    return toString() + "&handler=" + super.toString() + "&cd=" + myChildDescription + "&ps=" + myParentStrategy;
   }
 
   @Nullable

xml/dom-impl/src/com/intellij/util/xml/impl/PhysicalDomParentStrategy.java

@@ -66,6 +66,11 @@ public class PhysicalDomParentStrategy implements DomParentStrategy {
     return this;
   }
 
+  @Override
+  public String toString() {
+    return "Physical:" + myElement;
+  }
+
   @NotNull
   public DomParentStrategy clearXmlElement() {
     final DomInvocationHandler parent = getParentHandler();