Bug 296691 Change new Groups API to Virtual Resource API
If we decide that 'virtual' is the right naming for new resources concept, I will make the following changes. Add IResource#VIRTUAL flag to use in #create methods Add IResource#isVirtual indicating that a resource is virtual Remove IResource#isGroup Remove IFolder#createGroup
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/ide/undo/WorkspaceUndoUtil.java
* suitable for passing for passing to any
	 * {@link org.eclipse.core.commands.operations.IUndoableOperation} or
	 * {@link org.eclipse.core.commands.operations.IOperationHistory} method
	 * that requires an {@link org.eclipse.core.runtime.IAdaptable}
	 * <code>uiInfo</code> parameter.
	 * 
	 * @param shell
	 *            the shell that should be returned by the IAdaptable when asked
	 *            to adapt a shell. If this parameter is <code>null</code>,
	 *            the returned shell will also be <code>null</code>.
	 * 
	 * @return an IAdaptable that will return the specified shell.
	 */
	public static IAdaptable getUIInfoAdapter(final Shell shell) {
		return new IAdaptable() {
			public Object getAdapter(Class clazz) {
				if (clazz == Shell.class) {
					return shell;
				}
				return null;
			}
		};
	}
	private WorkspaceUndoUtil() {
		
	}
	/**
	 * Delete all of the specified resources, returning resource descriptions
	 * that can be used to restore them.
	 *