slots not re-rendering while passing $scopedSlots to children

[woshiguabi]

Version

2.7.14

Reproduction link

codesandbox.io

Steps to reproduce

Click the change button

What is expected?

slot re-rendering

What is actually happening?

slot not re-rendering

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To reproduce this issue, two conditions must be met

1. Both slot and scopedSlot are passed to the parent component
2. The parent component passes $scopedSlots to the child component

After deconstructing $scopedSlots this issue resolved, but this issue is important for library developers because passing $scopedSlots is a very common usage.

[yunchuan123]

I think it might be because you directly passed this.$scopedSlots into Inner.data.scopedSlots, which led to the implicit property $stable that was originally defined in Wrapper.$scopedSlots also being transferred to Inner.data.scopedSlots.
So this is why using the spread operator works fine, because the spread operator does not expand implicit properties.

excepted

.

actually（in your example）

And then, due to Vue's slot optimization mechanism, it ultimately led to the following logic...

So, Vue reused the previous scoped slot object, thereby reducing the rendering overhead.