TextEditorAction revertDeletion= new RestoreAction(this, true);
revertSelection.update();
revertBlock.update();
revertLine.update();
revertDeletion.update();
// only add block action if selection action is not enabled
if (revertSelection.isEnabled())
menu.appendToGroup(ITextEditorActionConstants.GROUP_RESTORE, revertSelection);
else if (revertBlock.isEnabled())