Spread Props in Component removes Reactivity

[dbowmanDT]

Describe the bug
Using the spread operator in a #each loop in variable deconstruction and use the spread props feature along side other explicit props, makes the explicit props not reactive.

Logs
See REPL

To Reproduce
https://svelte.dev/repl/3c742a2e9ab145139a64a8c344982a3e?version=3.9.2

There is a comment in the FieldSet.svelte component indicating how to remove the {...props} from being adding props to the component. Removing that will make reactivity work again.

To see it work properly, you can set this to version 3.6.7

Expected behavior
I expected to be able to use spread props along side explicit props and that everything is reactive. Note I was not able to reproduce unless the prop being spread was inside a #each and deconstructed.

Information about your Svelte project:
See REPL

Severity
This is very specific and important to the project I am working on because the spread operator is allows me to only set the variables that I want to override the defaults for. If I have to explicitly set each prop then I will end up overriding defaults that I do not want to.

[markjaquith]

This also prevents the index from updating.

https://svelte.dev/repl/3d1764569a2b480ca752b7a86c5f992a?version=3.12.1

[arggh]

Update: bug still exists with 3.15.0

<!-- will not re-render when $activeItems changes -->
<MyComp {...data} isActive={$activeItems.has(id)}/>

New repro using the latest Svelte.

https://svelte.dev/repl/53a3e235612d4daebbd3df318afe187d?version=3.15.0

[dbowmanDT]

@arggh Very nice. I too was going to check to see if this was incidentally fixed.

[jesper-bylund]

Is this still an issue? Seem to be having the same problem.

[pushkine]

replace <Item {...item} ></Item>
with <svelte:component this={(v)=>{Object.assign(v.props,item); return new Item(v)}}/>
looks like that side steps the problem
it might introduce other bugs
https://svelte.dev/repl/1da799b8838d445ca5a95019823ca220?version=3.15.0

[ddnn55]

I am seeing a similar issue, but only when I specify a key expression in the #each. Is this the same issue, or different? See here: https://svelte.dev/repl/f68a4c8fe9e546bb9f577922415e6968?version=3.19.1