public void showUser(final UserRef owner) {
        if (owner != null) {
            setQuickFilter(FindApiKeyCriteria.FIELD_DEF_OWNER_DISPLAY_NAME.getFilterQualifier()
                           + ":" + owner.getDisplayName());
        }
    }
Sets the quickFilter to filter on the passed user.
Use this when jumping to the screen from one of the other security screens.
stroom-core-client/src/main/java/stroom/security/client/presenter/ApiKeysListPresenter.java