如果不从curdoc中删除模型，则Bokeh属性更新不会更新模型

Question

以下代码是一个最小的问题示例，其中通过回调设置bokeh模型的属性时，该bokeh模型不会更新。我发现从curdoc的布局中删除并添加模型对象（甚至不是可疑对象）会强制其刷新。我已经通过第一次按下按钮显示了这一点。

是否存在一种更优雅的方法来强制bokeh重绘人物形象？

该示例是针对DataTable.columns.formatter的，但是我注意到这也适用于其他模型属性（包括轴范围，在这里我已经看到了一种变通方法，其中涉及在创建图形时显式设置范围以允许更新）。

public class ProjectingQueryDslJpaRepositoryImpl<T, ID extends Serializable> extends QuerydslJpaRepository<T, ID>
implements ProjectingQueryDslJpaRepository<T> {

    private static final EntityPathResolver DEFAULT_ENTITY_PATH_RESOLVER = SimpleEntityPathResolver.INSTANCE;

    private final EntityPath<T> path;
    private final Querydsl querydsl;

    public ProjectingQueryDslJpaRepositoryImpl(@NonNull JpaEntityInformation<T, ID> entityInformation, @NonNull EntityManager entityManager) {
        this(entityInformation, entityManager, DEFAULT_ENTITY_PATH_RESOLVER);
    }

    public ProjectingQueryDslJpaRepositoryImpl(@NonNull JpaEntityInformation<T, ID> entityInformation, @NonNull EntityManager entityManager,
                                           @NonNull EntityPathResolver resolver) {
        super(entityInformation, entityManager, resolver);

        this.path = resolver.createPath(entityInformation.getJavaType());
        PathBuilder<T> builder = new PathBuilder<>(path.getType(), path.getMetadata());
        this.querydsl = new Querydsl(entityManager, builder);
    }

    @Override
    public <P> Page<P> findPageProjectedBy(@NonNull Expression<P> factoryExpression, Predicate predicate, 
        @NonNull Pageable pageable) {

        final JPQLQuery<?> countQuery = createCountQuery(predicate);
        JPQLQuery<P> query = querydsl.applyPagination(pageable, createQuery(predicate).select(factoryExpression));

        return PageableExecutionUtils.getPage(query.fetch(), pageable, countQuery::fetchCount);
    }

    @Override
    public <P> Optional<P> findOneProjectedBy(@NonNull Expression<P> factoryExpression, @NonNull Predicate predicate) {
        try {
            return Optional.ofNullable(createQuery(predicate).select(factoryExpression).from(path).fetchOne());
        } catch (NonUniqueResultException ex) {
            throw new IncorrectResultSizeDataAccessException(ex.getMessage(), 1, ex);
        }
    }
}