Description Michal Tkacz 2004-12-11 12:22:51 EST

When a drag'n'drop operation is in progress and the cursor stops over a tree
node, it is supposed to expand to allow the user to select a drop target from a
subnode. This however doesn't work as expected when a DeferredTreeContentManager
is used in the tree viewer's content provider.

Steps to reproduce:
- check out org.eclipse.ui.examples.job project from the Eclipse CVS
- open org.eclipse.ui.examples.jobs.views.LazyTreeView class and put these lines
  at the end of createPartControl() method:

  Transfer[] transfers = new Transfer[] {TextTransfer.getInstance()};
  viewer.addDragSupport(DND.DROP_MOVE, transfers, new DragSourceAdapter());
  viewer.addDropSupport(DND.DROP_MOVE, transfers, new DropTargetAdapter() {
    public void dragOver(DropTargetEvent event) {
      event.feedback = DND.FEEDBACK_SELECT | DND.FEEDBACK_EXPAND;
    }
  });

- start runtime workbench
- open Lazy Trees view
- drag any item then stop the cursor over any item that hasn't been
  expanded yet

Notice that the "Pending..." node appears under the selected node but nothing
else happens until the drag'n'drop operation is over. This prevents the user
from selecting a subnode. The subnodes appear as soon as the mouse button is
released or the operation is cancelled.