Event propogation before component is created and conditional rendering

[lucpotage]

Version

2.6.8

Reproduction link

https://codesandbox.io/s/wwoxp636jk

Steps to reproduce

Add a click listener on window in a child component

What is expected?

Before Vue 2.6, the click event was not propagated to the child component because it was not created yet.

What is actually happening?

The click event is now propagated to the child after it is created and mounted.

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Do I need now to explicitly add the modifier .stop to all my parent click events if I add click listeners on window in my child components?

[posva]

Duplicate of #9340
Also see #9478 and #9464