`@const` erroneous rerender on slot prop update

[sxxov]

Describe the bug

When using the @const directive with a component that accepts slot props, as the slot prop changes & the component rerenders, the @const directive attached to it rerenders no matter what. Whilst that alone could be acceptable, the issue arrises when it doesn't trigger rerenders for its dependents, which creates desynch, especially when using side-effects.

Currently, the workaround I'm using is just to wrap what the @const directive would've had as its value, into a component, & using slot props. This is not very sustainable, once the number of directives increase.

Reproduction

https://svelte.dev/repl/80b36627ebea4c95beac69da22df90fd?version=3.58.0

In the REPL console, you can see const 1 constantly being logged, erroneously. Subsequently, even though const 1 is logged, const 2 isn't, even though it depends on a.

Logs

No response

System Info

n/a (tested fully on REPL)

Severity

annoyance

[sxxov]

This seems to be slightly related to #8513 in which calls to get_context seem to be the culprit. Where get_context is called, it evaluates the @const directive, regardless of whether or not its contents are dirty, & without marking anything inside its contents as dirty.

[dummdidumm]

Fixed in Svelte 5