Svelte 5: Element being re-mounted when input transition is changed within an #if block

[Thiagolino8]

Describe the bug

If an element inside an #if block has its intro transition changed after being mounted (either with the in: or transition: directive) the intro transition is executed again and the action also runs again (but only the first time the transition changes after the element is mounted)

Reproduction

Reproduction

Logs

No response

System Info

App.svelte (Svelte v5.0.0-next.25)

Severity

blocking an upgrade

[trueadm]

Thanks, I'll take a look when I'm back after the holidays :)

[Thiagolino8]

The transition has been fixed but the action is still re-executed

[svelte-kit-so-good]

What in the modular-ternaries is that example 😅? Could've just used an array.

[trueadm]

@svelte-kit-so-good Not sure I really understand what is going on there, it's a bit hard to follow.

[svelte-kit-so-good]

@trueadm .. eh the comment wasn't really constructive anyway ... just a difference in taste. Does this make it easier to follow?.

Edit: oh actually in the example I just gave why does the text inside the {#if} block only update once?

[trueadm]

@svelte-kit-so-good I don't see any issue here? Maybe I'm missing something. How does that work in Svelte 4?

[svelte-kit-so-good]

@trueadm ...oh it looks like if you change 'transition' to 'in' then it's fixed ... unsure if that's a bug:

- <p use:log transition:current>
+ <p use:log in:current>

Edit: yea it's not svelte5 specific. In both svelte4 and svelte5 the text updates once if using 'transition', otherwise it updates as expected if using 'in' 🤷‍♀️