Program: 95462
Project: 95462
Buggy source:
/** 
 * Checks whether the nodes in the given selection can legally be moved to the given target location.
 * @param sourceViewer The viewer containing the dragged/cut item.
 * @param targetViewer The viewer to which the item is to be dropped/pasted.
 * @param selection The selection to check.
 * @param target The target location to check.
 * @param allowFromBrowser Whether items from the Test Case Browser are allowed to be dropped/pasted.
 * @return <code>true</code> if the move is legal. Otherwise, <code>false</code>.
 */
public static boolean validateDrop(Viewer sourceViewer,Viewer targetViewer,IStructuredSelection selection,Object target,boolean allowFromBrowser){
  if (selection == null || target == null) {
    return false;
  }
  if (sourceViewer != null && !sourceViewer.equals(targetViewer)) {
    boolean foundOne=false;
    for (    TestCaseBrowser tcb : MultipleTCBTracker.getInstance().getOpenTCBs()) {
      if (sourceViewer.equals(tcb.getTreeViewer())) {
        foundOne=true;
      }
    }
    if (!(allowFromBrowser && foundOne)) {
      return false;
    }
  }
  Iterator iter=selection.iterator();
  while (iter.hasNext()) {
    Object transferObj=iter.next();
    if (!(transferObj instanceof INodePO)) {
      return false;
    }
    INodePO transferGUI=(INodePO)transferObj;
    if (!((transferGUI instanceof IExecTestCasePO && sourceViewer == targetViewer) || (transferGUI instanceof ICommentPO && sourceViewer == targetViewer) || (transferGUI instanceof ISpecTestCasePO))) {
      return false;
    }
  }
  return true;
}

Fixed version (ground truth):
/** 
 * Checks whether the nodes in the given selection can legally be moved to the given target location.
 * @param sourceViewer The viewer containing the dragged/cut item.
 * @param targetViewer The viewer to which the item is to be dropped/pasted.
 * @param selection The selection to check.
 * @param target The target location to check.
 * @param allowFromBrowser Whether items from the Test Case Browser are allowed to be dropped/pasted.
 * @return <code>true</code> if the move is legal. Otherwise, <code>false</code>.
 */
public static boolean validateDrop(Viewer sourceViewer,Viewer targetViewer,IStructuredSelection selection,Object target,boolean allowFromBrowser){
  if (selection == null || !(target instanceof INodePO)) {
    return false;
  }
  INodePO targNode=(INodePO)target;
  if (sourceViewer != null && !sourceViewer.equals(targetViewer)) {
    boolean foundOne=false;
    for (    TestCaseBrowser tcb : MultipleTCBTracker.getInstance().getOpenTCBs()) {
      if (sourceViewer.equals(tcb.getTreeViewer())) {
        foundOne=true;
      }
    }
    if (!(allowFromBrowser && foundOne)) {
      return false;
    }
  }
  Iterator iter=selection.iterator();
  while (iter.hasNext()) {
    Object next=iter.next();
    if (!(next instanceof INodePO) || next instanceof IAbstractContainerPO) {
      return false;
    }
    if (next instanceof IControllerPO && !(targNode instanceof ITestSuitePO) && !(targNode.getParentNode() instanceof ITestSuitePO)) {
      return false;
    }
    INodePO node=(INodePO)next;
    if (!((node instanceof IExecTestCasePO && sourceViewer == targetViewer) || (node instanceof ICommentPO && sourceViewer == targetViewer) || (node instanceof ISpecTestCasePO)|| (node instanceof IControllerPO))) {
      return false;
    }
  }
  return true;
}