Program: 93684
Project: 93684
Buggy source:
/** 
 * Check if the element to remove exists in at least one (<code>strict = false</code>) or in all ( <code>strict = true</code>) corresponding elements. Get all elements to delete and check whether they are distributed over all parents. Unlike   {@link MPatchValidator#validateAddElementState(IndepAddRemElementChange,Map,boolean)}, this does not check whether they elements to delete are really described by the model descriptors. This allows the user to delete more elements than only strictly those that are deleted.
 */
protected static ValidationResult validateRemoveElementState(IndepAddRemElementChange change,Map<IElementReference,List<EObject>> map,boolean strict){
  final SymRefCheck toDeleteCheck=new SymRefCheck(change.getSubModelReference(),map,change.getSubModel().getType(),change.getSubModelReference().getUpperBound());
  if (toDeleteCheck.symRef == null || toDeleteCheck.internal)   throw new IllegalStateException("String_Node_Str");
  final int elementCountToDelete=toDeleteCheck.elements.size();
  final ResultAccumulator result=new ResultAccumulator();
  if (elementCountToDelete > 0) {
    for (    final EObject parent : map.get(change.getCorrespondingElement())) {
      if (change.getContainment().isMany()) {
        @SuppressWarnings("String_Node_Str") final EList<EObject> rawList=(EList<EObject>)parent.eGet(change.getContainment());
        final List<EObject> toDelete=new ArrayList<EObject>(rawList);
        toDelete.retainAll(toDeleteCheck.elements);
        toDeleteCheck.elements.removeAll(toDelete);
        result.before|=!toDelete.isEmpty();
      }
 else {
        final Object toDelete=parent.eGet(change.getContainment());
        result.invalid|=toDelete == null || !toDeleteCheck.elements.contains(toDelete);
        result.before|=toDelete != null && toDeleteCheck.elements.remove(toDelete);
      }
    }
  }
 else {
    result.after=true;
  }
  return result.accumulate(strict);
}

Fixed version (ground truth):
/** 
 * Check if the element to remove exists in at least one (<code>strict = false</code>) or in all ( <code>strict = true</code>) corresponding elements. Get all elements to delete and check whether they are distributed over all parents. Unlike   {@link MPatchValidator#validateAddElementState(IndepAddRemElementChange,Map,boolean)}, this does not check whether they elements to delete are really described by the model descriptors. This allows the user to delete more elements than only strictly those that are deleted.
 */
protected static ValidationResult validateRemoveElementState(IndepAddRemElementChange change,Map<IElementReference,List<EObject>> map,boolean strict){
  final SymRefCheck toDeleteCheck=new SymRefCheck(change.getSubModelReference(),map,change.getSubModel().getType(),change.getSubModelReference().getUpperBound());
  if (toDeleteCheck.symRef == null || toDeleteCheck.internal)   throw new IllegalStateException("String_Node_Str");
  final int elementCountToDelete=toDeleteCheck.elements.size();
  final ResultAccumulator result=new ResultAccumulator();
  if (elementCountToDelete > 0) {
    for (    final EObject parent : map.get(change.getCorrespondingElement())) {
      if (change.getContainment().isMany()) {
        @SuppressWarnings("String_Node_Str") final EList<EObject> rawList=(EList<EObject>)parent.eGet(change.getContainment());
        final List<EObject> toDelete=new ArrayList<EObject>(rawList);
        toDelete.retainAll(toDeleteCheck.elements);
        toDeleteCheck.elements.removeAll(toDelete);
        result.before|=!toDelete.isEmpty();
        result.after|=toDelete.isEmpty();
      }
 else {
        final Object toDelete=parent.eGet(change.getContainment());
        result.invalid|=toDelete == null || !toDeleteCheck.elements.contains(toDelete);
        result.before|=toDelete != null && toDeleteCheck.elements.remove(toDelete);
      }
    }
  }
 else {
    result.after=true;
  }
  return result.accumulate(strict);
}