manager.add(new Separator("exportImportGroup"));
  private void fillTableMenu(IMenuManager manager) {    // file actions go first (view file)    manager.add(new Separator(IWorkbenchActionConstants.GROUP_FILE));    // Add the "Add to Workspace" action if 1 revision is selected.    ISelection sel = tableHistoryViewer.getSelection();    if( !sel.isEmpty()) {      if(sel instanceof IStructuredSelection) {        if(((IStructuredSelection) sel).size() == 1) {          if(resource != null && resource instanceof IFile) {            manager.add(getGetContentsAction());            manager.add(getUpdateToRevisionAction());          }          manager.add(getShowDifferencesAsUnifiedDiffAction());          // if (resource != null) {          manager.add(getCreateTagFromRevisionAction());          // }          manager.add(getSetCommitPropertiesAction());        }        if(resource != null)          manager.add(getRevertChangesAction());      }    }    manager.add(new Separator("additions")); //$NON-NLS-1$    manager.add(getRefreshAction());    manager.add(new Separator("additions-end")); //$NON-NLS-1$  }