Bug 312540 [LinkedResources] Copy resource in Navigator and Project Explorer always shows dialog
N20100511-2000. When copying an IFile from one to another folder in the Navigator or Project Explorer, I always get the dialog no matter how I've set the preferences on the 'Linked Resources' page (even if I disable linked resources).
bundles/org.eclipse.ui.navigator.resources/src/org/eclipse/ui/navigator/resources/ResourceDropAdapterAssistant.java
if ((aDropAdapter.getCurrentOperation() == DND.DROP_COPY)
					|| (aDropAdapter.getCurrentOperation() == DND.DROP_LINK)) {
				if (Policy.DEBUG_DND) {
					System.out
							.println("ResourceDropAdapterAssistant.handleDrop executing COPY."); 
				}
				status = performResourceCopy(aDropAdapter, getShell(),
						resources);
			} else {
				if (Policy.DEBUG_DND) {
					System.out
							.println("ResourceDropAdapterAssistant.handleDrop executing MOVE."); 
				}
				status = performResourceMove(aDropAdapter, resources);
			}
		}
		openError(status);
		IContainer target = getActualTarget((IResource) aTarget);
		if (target != null && target.isAccessible()) {
			try {
				target.refreshLocal(IResource.DEPTH_ONE, null);
			} catch (CoreException e) {
			}
		}
		return status;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.navigator.CommonDropAdapterAssistant#validatePluginTransferDrop(org.eclipse.jface.viewers.IStructuredSelection,