[BUG] calendar月视图，event显示不全

[lyj-514328]

Is there an existing issue for this?

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Which Component

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Semi Version

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Current Behavior

截图得单元格包含的event比较多，无法被完全显示；但是下面的项覆盖了一个单元格；
看上去像是计算event哪些能够被显示得时候，没有考虑到下面的文字？

Expected Behavior

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Steps To Reproduce

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ReproducibleCode

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Anything else?

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