Table: fix table header slot not reactive #21297
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close #20453
只有slot的情况下,table-header无法收集到slot组件下的依赖信息,造成了data的改变没有触发table-header更新。
pr里的解决方案是:有设置slot情况下,在beforeUpdate时,重新给renderHeader赋值,触发table-header的更新。
dev
branch.