Mounting child component re-renders host component

[pielambr]

Hi all,

To facilitate a Svelte router, I'm currently making a component that takes care of the lifecycle of it's child components.

https://svelte.dev/repl/0bd735145fd94540ac78b39eab3521aa?version=3.6.7

As you can see from the REPL, it seems that as soon as I bind the new view, the parent component gets recreated as well, resulting in an infinite loop.

Is this expected behaviour?

[creaven]

If you add import { current_component } from 'svelte/internal' and console.log(current_component) in onMount callback you will see that it is called for Test component. onMount is called for current_component, see https://github.com/sveltejs/svelte/blob/master/src/runtime/internal/lifecycle.ts
Why doing such tricky implementation with new Test, instead of using <svelte:component this={Test}></svelte:component>, if component should be dynamic?

[Conduitry]

Duplicate of #3218.