Bug 216860 [GlobalActions] Copy is not enabled for resources with alternate file systems
bundles/org.eclipse.ui.navigator.resources/src/org/eclipse/ui/internal/navigator/resources/actions/CopyAction.java
*
     * @param shell the shell for any dialogs
     * @param clipboard a platform clipboard
     */
    public CopyAction(Shell shell, Clipboard clipboard) {
        super(WorkbenchNavigatorMessages.CopyAction_Cop_); 
        Assert.isNotNull(shell);
        Assert.isNotNull(clipboard);
        this.shell = shell;
        this.clipboard = clipboard;
        setToolTipText(WorkbenchNavigatorMessages.CopyAction_Copy_selected_resource_s_); 
        setId(CopyAction.ID);
        PlatformUI.getWorkbench().getHelpSystem().setHelp(this, "CopyHelpId"); 
				
    }
    /**
     * Creates a new action.
     *
     * @param shell the shell for any dialogs
     * @param clipboard a platform clipboard
     * @param pasteAction a paste action
     * 
     * @since 2.0
     */
    public CopyAction(Shell shell, Clipboard clipboard, PasteAction pasteAction) {
        this(shell, clipboard);
        this.pasteAction = pasteAction;
    }
    /**
     * The <code>CopyAction</code> implementation of this method defined