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fix: measure nested transitions before applying their starting styles - #18647

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fix: measure nested transitions before applying their starting styles#18647
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@61021 61021 commented Aug 15, 2026

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Fixes #18421 (regression from #16035, which re-broke the #4784 scenario).

Since #16035 the dummy delay animation runs with fill: 'forwards', so an intro's t = 0 styles (for slide, height: 0) apply the moment the transition is created and stay applied until the real animation starts a frame later. Transition functions of other elements in the same batch run after that and measure a collapsed DOM. With nested intros (the TreeView from the issue), intro effects run deepest-first, so every ancestor's slide captures a height where its children are pinned at 0. On the issue's REPL every <ul> animates 0px -> 36px (the height of a single row) and then jumps to its real size when the animation finishes, which is the "children pop out" behavior from #4784.

The fix waits one microtask before applying the initial styles and creating the dummy, the same way deferred transitions (crossfade) already work in animate(). Everything in the batch measures the DOM first; the microtask still runs before the next paint, so elements never render unstyled and the #14732 behavior is preserved. Verified in a real browser that a delayed intro (delay: 300) stays held at height: 0 for the whole delay, including the first painted frame.

Most of the diff is the existing dummy/onfinish block moving into queue_micro_task; hiding whitespace shows the actual change.

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@61021 @claude
fix: measure nested transitions before applying their starting styles
8423f6c 
Co-authored-by: Claude <noreply@anthropic.com>
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Install the latest version of svelte from 6e909d6:

pnpm add https://pkg.svelte.dev/svelte/c/6e909d6e437c0ef08ad124236514b996eff5eb45

Open in pkg.svelte.dev: https://pkg.svelte.dev/repos/svelte/pr/18647

Note

This PR is from a fork. A maintainer must approve approve each commit before it can be built and installed.

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🦋 Changeset detected

Latest commit: 6e909d6

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package
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dummdidumm self-requested a review August 25, 2026 14:25
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dummdidumm approved these changes Aug 25, 2026
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thank you!

@dummdidumm
dummdidumm merged commit 955b701 into sveltejs:main Aug 25, 2026
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@github-actions github-actions Bot mentioned this pull request Aug 25, 2026
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dummdidumm pushed a commit that referenced this pull request Aug 28, 2026
@github-actions
Version Packages (#18682)
7bc0a70 
This PR was opened by the [Changesets
release](https://github.com/changesets/action) GitHub action. When
you're ready to do a release, you can merge this and the packages will
be published to npm automatically. If you're not ready to do a release
yet, that's fine, whenever you add more changesets to main, this PR will
be updated.


# Releases
## svelte@5.57.0

### Minor Changes

- feat: export `RenderOutput`, `SyncRenderOutput`, `Csp` and
`Sha256Source` from `svelte/server`
([#18648](#18648))

- feat: add `has` function to `createContext`
([#18472](#18472))

- feat: support `defaultValue` on `<select>`
([#18591](#18591))

- feat: add getOrInsert/getOrInsertComputed to SvelteMap
([#18728](#18728))

### Patch Changes

- fix: block template store subscriptions on the promise that assigns
the store ([#18582](#18582))

- fix: route $derived teardown errors through invoke_error_boundary
([#18486](#18486))

- fix: track SvelteDate snapshots in reactions
([#18700](#18700))

- fix: remove `<svelte:head>` anchors on unmount
([#18697](#18697))

- fix: warn on undeclared shorthand event handlers on `<svelte:window>`,
`<svelte:document>` and `<svelte:body>`
([#18480](#18480))

- perf: reuse the cached value in the `<option>`/`<select>` value guard
([#18713](#18713))

- fix: prevent malformed AST output for `<select>` with static `value`
attribute ([#18449](#18449))

- fix: apply ownership mutation ignores to binding assignments
([#18718](#18718))

- fix: prevent onoutroend from firing twice when compilerOptions.hmr is
true ([#18655](#18655))

- fix: preserve whitespace after inline elements when printing
([#18685](#18685))

- perf: fold SSR block-open markers into the branch's first push
([#18712](#18712))

- fix: run `onDestroy` callbacks when a server render throws
([#18585](#18585))

- fix: report `derived_invalid_export` for `export let x =
$derived(...)` in runes mode
([#18692](#18692))

- fix: never apply class hash to elements inside `<svelte:head>`
([#18160](#18160))

- fix: keep `defaultChecked` on hydrated radio inputs with spread
attributes ([#18701](#18701))

- fix: accept `onfocusin`/`onfocusout` in
`a11y_mouse_events_have_key_events`
([#18689](#18689))

- perf: O(n²)→O(n) Map lookups for legacy `$:` reactive statement
ordering ([#18602](#18602))

- fix: distinct memoizer on style/class directives
([#18466](#18466))

- fix: measure nested transitions before applying their starting styles
([#18647](#18647))

- fix: don't turn component instances stored in `$state` into state
proxies ([#18646](#18646))

- perf: emit `$.only_child` for elements with a single child
([#18717](#18717))

- fix: omit `bind:focused` from SSR output (it has no HTML attribute)
([#18724](#18724))

- fix: more robust rendering of Svelte custom element slots
([#18710](#18710))

- perf: optimize simple object destructuring in `@const` tags
([#18390](#18390))

- fix: properly apply static textarea value attribute during CSR
([#18727](#18727))

- fix: end a restored reaction context at the end of its synchronous
segment ([#18694](#18694))

- fix: keep the dependencies of a reaction that throws, so deriveds it
read are neither leaked nor stuck in their error
([#18703](#18703))

- fix: don't resurrect outroing elements when an ancestor block is
paused and resumed
([#18431](#18431))

- perf: use `$.comment()` for single-comment templates
([#18714](#18714))

- chore: move `@types/trusted-types` to devDependencies
([#18730](#18730))

- perf: store setters cache as `Set` instead of `Array`
([#18251](#18251))

- fix: transform derived assignments and select function bindings
correctly during server-side rendering
([#18669](#18669))

- fix: keep boolean attributes with an empty string value when rendering
attribute objects on the server
([#18721](#18721))

- fix: sync `SvelteURL` port signal when the protocol setter clears the
port ([#18705](#18705))

- fix: block declaration tags and `{@const}` on async values read inside
closures ([#18533](#18533))

- fix: avoid css tree-shaking for exported Snippet
([#18540](#18540))

- perf: treat `<img loading>` as a static element again
([#18711](#18711))

- fix: prevent `selectedcontent` mutation from changing the selected
option ([#18495](#18495))

- fix: avoid `NaN` keyframe values in `slide` transition for elements
without a layout box
([#18430](#18430))

- fix: preserve line feed character references in attribute values
([#18691](#18691))

- fix: decode uppercase-`X` hex numeric character references (`&#X...;`)
([#18708](#18708))

- chore: clarify when `$effect.pre` runs relative to DOM updates
([#18534](#18534))

- fix: scope SSR boundary failed snippets to their boundary
([#18593](#18593))

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
This was referenced Aug 29, 2026
Closed
Closed
Closed
dadezzz pushed a commit to dadezzz/events-cash-register that referenced this pull request Sep 1, 2026
Renovate [bot] Forgejo
fix(deps): update dependency svelte to v5.57.0 (#231)
3cc3889 
This PR contains the following updates:

| Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [svelte](https://svelte.dev) ([source](https://github.com/sveltejs/svelte/tree/HEAD/packages/svelte)) | [`5.56.10` → `5.57.0`](https://renovatebot.com/diffs/npm/svelte/5.56.10/5.57.0) | ![age](https://developer.mend.io/api/mc/badges/age/npm/svelte/5.57.0?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/svelte/5.56.10/5.57.0?slim=true) |

---

### Release Notes

<details>
<summary>sveltejs/svelte (svelte)</summary>

### [`v5.57.0`](https://github.com/sveltejs/svelte/blob/HEAD/packages/svelte/CHANGELOG.md#5570)

[Compare Source](https://github.com/sveltejs/svelte/compare/svelte@5.56.10...svelte@5.57.0)

##### Minor Changes

- feat: export `RenderOutput`, `SyncRenderOutput`, `Csp` and `Sha256Source` from `svelte/server` ([#&#8203;18648](sveltejs/svelte#18648))

- feat: add `has` function to `createContext` ([#&#8203;18472](sveltejs/svelte#18472))

- feat: support `defaultValue` on `<select>` ([#&#8203;18591](sveltejs/svelte#18591))

- feat: add getOrInsert/getOrInsertComputed to SvelteMap ([#&#8203;18728](sveltejs/svelte#18728))

##### Patch Changes

- fix: block template store subscriptions on the promise that assigns the store ([#&#8203;18582](sveltejs/svelte#18582))

- fix: route $derived teardown errors through invoke\_error\_boundary ([#&#8203;18486](sveltejs/svelte#18486))

- fix: track SvelteDate snapshots in reactions ([#&#8203;18700](sveltejs/svelte#18700))

- fix: remove `<svelte:head>` anchors on unmount ([#&#8203;18697](sveltejs/svelte#18697))

- fix: warn on undeclared shorthand event handlers on `<svelte:window>`, `<svelte:document>` and `<svelte:body>` ([#&#8203;18480](sveltejs/svelte#18480))

- perf: reuse the cached value in the `<option>`/`<select>` value guard ([#&#8203;18713](sveltejs/svelte#18713))

- fix: prevent malformed AST output for `<select>` with static `value` attribute ([#&#8203;18449](sveltejs/svelte#18449))

- fix: apply ownership mutation ignores to binding assignments ([#&#8203;18718](sveltejs/svelte#18718))

- fix: prevent onoutroend from firing twice when compilerOptions.hmr is true ([#&#8203;18655](sveltejs/svelte#18655))

- fix: preserve whitespace after inline elements when printing ([#&#8203;18685](sveltejs/svelte#18685))

- perf: fold SSR block-open markers into the branch's first push ([#&#8203;18712](sveltejs/svelte#18712))

- fix: run `onDestroy` callbacks when a server render throws ([#&#8203;18585](sveltejs/svelte#18585))

- fix: report `derived_invalid_export` for `export let x = $derived(...)` in runes mode ([#&#8203;18692](sveltejs/svelte#18692))

- fix: never apply class hash to elements inside `<svelte:head>` ([#&#8203;18160](sveltejs/svelte#18160))

- fix: keep `defaultChecked` on hydrated radio inputs with spread attributes ([#&#8203;18701](sveltejs/svelte#18701))

- fix: accept `onfocusin`/`onfocusout` in `a11y_mouse_events_have_key_events` ([#&#8203;18689](sveltejs/svelte#18689))

- perf: O(n²)→O(n) Map lookups for legacy `$:` reactive statement ordering ([#&#8203;18602](sveltejs/svelte#18602))

- fix: distinct memoizer on style/class directives ([#&#8203;18466](sveltejs/svelte#18466))

- fix: measure nested transitions before applying their starting styles ([#&#8203;18647](sveltejs/svelte#18647))

- fix: don't turn component instances stored in `$state` into state proxies ([#&#8203;18646](sveltejs/svelte#18646))

- perf: emit `$.only_child` for elements with a single child ([#&#8203;18717](sveltejs/svelte#18717))

- fix: omit `bind:focused` from SSR output (it has no HTML attribute) ([#&#8203;18724](sveltejs/svelte#18724))

- fix: more robust rendering of Svelte custom element slots ([#&#8203;18710](sveltejs/svelte#18710))

- perf: optimize simple object destructuring in `@const` tags ([#&#8203;18390](sveltejs/svelte#18390))

- fix: properly apply static textarea value attribute during CSR ([#&#8203;18727](sveltejs/svelte#18727))

- fix: end a restored reaction context at the end of its synchronous segment ([#&#8203;18694](sveltejs/svelte#18694))

- fix: keep the dependencies of a reaction that throws, so deriveds it read are neither leaked nor stuck in their error ([#&#8203;18703](sveltejs/svelte#18703))

- fix: don't resurrect outroing elements when an ancestor block is paused and resumed ([#&#8203;18431](sveltejs/svelte#18431))

- perf: use `$.comment()` for single-comment templates ([#&#8203;18714](sveltejs/svelte#18714))

- chore: move `@types/trusted-types` to devDependencies ([#&#8203;18730](sveltejs/svelte#18730))

- perf: store setters cache as `Set` instead of `Array` ([#&#8203;18251](sveltejs/svelte#18251))

- fix: transform derived assignments and select function bindings correctly during server-side rendering ([#&#8203;18669](sveltejs/svelte#18669))

- fix: keep boolean attributes with an empty string value when rendering attribute objects on the server ([#&#8203;18721](sveltejs/svelte#18721))

- fix: sync `SvelteURL` port signal when the protocol setter clears the port ([#&#8203;18705](sveltejs/svelte#18705))

- fix: block declaration tags and `{@const}` on async values read inside closures ([#&#8203;18533](sveltejs/svelte#18533))

- fix: avoid css tree-shaking for exported Snippet ([#&#8203;18540](sveltejs/svelte#18540))

- perf: treat `<img loading>` as a static element again ([#&#8203;18711](sveltejs/svelte#18711))

- fix: prevent `selectedcontent` mutation from changing the selected option ([#&#8203;18495](sveltejs/svelte#18495))

- fix: avoid `NaN` keyframe values in `slide` transition for elements without a layout box ([#&#8203;18430](sveltejs/svelte#18430))

- fix: preserve line feed character references in attribute values ([#&#8203;18691](sveltejs/svelte#18691))

- fix: decode uppercase-`X` hex numeric character references (`&#X...;`) ([#&#8203;18708](sveltejs/svelte#18708))

- chore: clarify when `$effect.pre` runs relative to DOM updates ([#&#8203;18534](sveltejs/svelte#18534))

- fix: scope SSR boundary failed snippets to their boundary ([#&#8203;18593](sveltejs/svelte#18593))

</details>

---

### Configuration

📅 **Schedule**: (UTC)

- Branch creation
  - At any time (no schedule defined)
- Automerge
  - At any time (no schedule defined)

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Mend Renovate CLI](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0NC41Mi4xIiwidXBkYXRlZEluVmVyIjoiNDQuNTIuMSIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOltdfQ==-->
renovate Bot added a commit to cigaleapp/cigale that referenced this pull request Sep 6, 2026
@renovate
⬆️ Update dependency svelte to ^5.57.0
900c896 
##### [v5.57.0](https://github.com/sveltejs/svelte/blob/HEAD/packages/svelte/CHANGELOG.md#5570)

##### Minor Changes

- feat: export `RenderOutput`, `SyncRenderOutput`, `Csp` and `Sha256Source` from `svelte/server` ([#18648](sveltejs/svelte#18648))

- feat: add `has` function to `createContext` ([#18472](sveltejs/svelte#18472))

- feat: support `defaultValue` on `<select>` ([#18591](sveltejs/svelte#18591))

- feat: add getOrInsert/getOrInsertComputed to SvelteMap ([#18728](sveltejs/svelte#18728))

##### Patch Changes

- fix: block template store subscriptions on the promise that assigns the store ([#18582](sveltejs/svelte#18582))

- fix: route $derived teardown errors through invoke\_error\_boundary ([#18486](sveltejs/svelte#18486))

- fix: track SvelteDate snapshots in reactions ([#18700](sveltejs/svelte#18700))

- fix: remove `<svelte:head>` anchors on unmount ([#18697](sveltejs/svelte#18697))

- fix: warn on undeclared shorthand event handlers on `<svelte:window>`, `<svelte:document>` and `<svelte:body>` ([#18480](sveltejs/svelte#18480))

- perf: reuse the cached value in the `<option>`/`<select>` value guard ([#18713](sveltejs/svelte#18713))

- fix: prevent malformed AST output for `<select>` with static `value` attribute ([#18449](sveltejs/svelte#18449))

- fix: apply ownership mutation ignores to binding assignments ([#18718](sveltejs/svelte#18718))

- fix: prevent onoutroend from firing twice when compilerOptions.hmr is true ([#18655](sveltejs/svelte#18655))

- fix: preserve whitespace after inline elements when printing ([#18685](sveltejs/svelte#18685))

- perf: fold SSR block-open markers into the branch's first push ([#18712](sveltejs/svelte#18712))

- fix: run `onDestroy` callbacks when a server render throws ([#18585](sveltejs/svelte#18585))

- fix: report `derived_invalid_export` for `export let x = $derived(...)` in runes mode ([#18692](sveltejs/svelte#18692))

- fix: never apply class hash to elements inside `<svelte:head>` ([#18160](sveltejs/svelte#18160))

- fix: keep `defaultChecked` on hydrated radio inputs with spread attributes ([#18701](sveltejs/svelte#18701))

- fix: accept `onfocusin`/`onfocusout` in `a11y_mouse_events_have_key_events` ([#18689](sveltejs/svelte#18689))

- perf: O(n²)→O(n) Map lookups for legacy `$:` reactive statement ordering ([#18602](sveltejs/svelte#18602))

- fix: distinct memoizer on style/class directives ([#18466](sveltejs/svelte#18466))

- fix: measure nested transitions before applying their starting styles ([#18647](sveltejs/svelte#18647))

- fix: don't turn component instances stored in `$state` into state proxies ([#18646](sveltejs/svelte#18646))

- perf: emit `$.only_child` for elements with a single child ([#18717](sveltejs/svelte#18717))

- fix: omit `bind:focused` from SSR output (it has no HTML attribute) ([#18724](sveltejs/svelte#18724))

- fix: more robust rendering of Svelte custom element slots ([#18710](sveltejs/svelte#18710))

- perf: optimize simple object destructuring in `@const` tags ([#18390](sveltejs/svelte#18390))

- fix: properly apply static textarea value attribute during CSR ([#18727](sveltejs/svelte#18727))

- fix: end a restored reaction context at the end of its synchronous segment ([#18694](sveltejs/svelte#18694))

- fix: keep the dependencies of a reaction that throws, so deriveds it read are neither leaked nor stuck in their error ([#18703](sveltejs/svelte#18703))

- fix: don't resurrect outroing elements when an ancestor block is paused and resumed ([#18431](sveltejs/svelte#18431))

- perf: use `$.comment()` for single-comment templates ([#18714](sveltejs/svelte#18714))

- chore: move `@types/trusted-types` to devDependencies ([#18730](sveltejs/svelte#18730))

- perf: store setters cache as `Set` instead of `Array` ([#18251](sveltejs/svelte#18251))

- fix: transform derived assignments and select function bindings correctly during server-side rendering ([#18669](sveltejs/svelte#18669))

- fix: keep boolean attributes with an empty string value when rendering attribute objects on the server ([#18721](sveltejs/svelte#18721))

- fix: sync `SvelteURL` port signal when the protocol setter clears the port ([#18705](sveltejs/svelte#18705))

- fix: block declaration tags and `{@const}` on async values read inside closures ([#18533](sveltejs/svelte#18533))

- fix: avoid css tree-shaking for exported Snippet ([#18540](sveltejs/svelte#18540))

- perf: treat `<img loading>` as a static element again ([#18711](sveltejs/svelte#18711))

- fix: prevent `selectedcontent` mutation from changing the selected option ([#18495](sveltejs/svelte#18495))

- fix: avoid `NaN` keyframe values in `slide` transition for elements without a layout box ([#18430](sveltejs/svelte#18430))

- fix: preserve line feed character references in attribute values ([#18691](sveltejs/svelte#18691))

- fix: decode uppercase-`X` hex numeric character references (`&#X...;`) ([#18708](sveltejs/svelte#18708))

- chore: clarify when `$effect.pre` runs relative to DOM updates ([#18534](sveltejs/svelte#18534))

- fix: scope SSR boundary failed snippets to their boundary ([#18593](sveltejs/svelte#18593))
renovate Bot added a commit to cigaleapp/cigale that referenced this pull request Sep 7, 2026
@renovate
⬆️ Update dependency svelte to ^5.57.0
c6457b0 
##### [v5.57.0](https://github.com/sveltejs/svelte/blob/HEAD/packages/svelte/CHANGELOG.md#5570)

##### Minor Changes

- feat: export `RenderOutput`, `SyncRenderOutput`, `Csp` and `Sha256Source` from `svelte/server` ([#18648](sveltejs/svelte#18648))

- feat: add `has` function to `createContext` ([#18472](sveltejs/svelte#18472))

- feat: support `defaultValue` on `<select>` ([#18591](sveltejs/svelte#18591))

- feat: add getOrInsert/getOrInsertComputed to SvelteMap ([#18728](sveltejs/svelte#18728))

##### Patch Changes

- fix: block template store subscriptions on the promise that assigns the store ([#18582](sveltejs/svelte#18582))

- fix: route $derived teardown errors through invoke\_error\_boundary ([#18486](sveltejs/svelte#18486))

- fix: track SvelteDate snapshots in reactions ([#18700](sveltejs/svelte#18700))

- fix: remove `<svelte:head>` anchors on unmount ([#18697](sveltejs/svelte#18697))

- fix: warn on undeclared shorthand event handlers on `<svelte:window>`, `<svelte:document>` and `<svelte:body>` ([#18480](sveltejs/svelte#18480))

- perf: reuse the cached value in the `<option>`/`<select>` value guard ([#18713](sveltejs/svelte#18713))

- fix: prevent malformed AST output for `<select>` with static `value` attribute ([#18449](sveltejs/svelte#18449))

- fix: apply ownership mutation ignores to binding assignments ([#18718](sveltejs/svelte#18718))

- fix: prevent onoutroend from firing twice when compilerOptions.hmr is true ([#18655](sveltejs/svelte#18655))

- fix: preserve whitespace after inline elements when printing ([#18685](sveltejs/svelte#18685))

- perf: fold SSR block-open markers into the branch's first push ([#18712](sveltejs/svelte#18712))

- fix: run `onDestroy` callbacks when a server render throws ([#18585](sveltejs/svelte#18585))

- fix: report `derived_invalid_export` for `export let x = $derived(...)` in runes mode ([#18692](sveltejs/svelte#18692))

- fix: never apply class hash to elements inside `<svelte:head>` ([#18160](sveltejs/svelte#18160))

- fix: keep `defaultChecked` on hydrated radio inputs with spread attributes ([#18701](sveltejs/svelte#18701))

- fix: accept `onfocusin`/`onfocusout` in `a11y_mouse_events_have_key_events` ([#18689](sveltejs/svelte#18689))

- perf: O(n²)→O(n) Map lookups for legacy `$:` reactive statement ordering ([#18602](sveltejs/svelte#18602))

- fix: distinct memoizer on style/class directives ([#18466](sveltejs/svelte#18466))

- fix: measure nested transitions before applying their starting styles ([#18647](sveltejs/svelte#18647))

- fix: don't turn component instances stored in `$state` into state proxies ([#18646](sveltejs/svelte#18646))

- perf: emit `$.only_child` for elements with a single child ([#18717](sveltejs/svelte#18717))

- fix: omit `bind:focused` from SSR output (it has no HTML attribute) ([#18724](sveltejs/svelte#18724))

- fix: more robust rendering of Svelte custom element slots ([#18710](sveltejs/svelte#18710))

- perf: optimize simple object destructuring in `@const` tags ([#18390](sveltejs/svelte#18390))

- fix: properly apply static textarea value attribute during CSR ([#18727](sveltejs/svelte#18727))

- fix: end a restored reaction context at the end of its synchronous segment ([#18694](sveltejs/svelte#18694))

- fix: keep the dependencies of a reaction that throws, so deriveds it read are neither leaked nor stuck in their error ([#18703](sveltejs/svelte#18703))

- fix: don't resurrect outroing elements when an ancestor block is paused and resumed ([#18431](sveltejs/svelte#18431))

- perf: use `$.comment()` for single-comment templates ([#18714](sveltejs/svelte#18714))

- chore: move `@types/trusted-types` to devDependencies ([#18730](sveltejs/svelte#18730))

- perf: store setters cache as `Set` instead of `Array` ([#18251](sveltejs/svelte#18251))

- fix: transform derived assignments and select function bindings correctly during server-side rendering ([#18669](sveltejs/svelte#18669))

- fix: keep boolean attributes with an empty string value when rendering attribute objects on the server ([#18721](sveltejs/svelte#18721))

- fix: sync `SvelteURL` port signal when the protocol setter clears the port ([#18705](sveltejs/svelte#18705))

- fix: block declaration tags and `{@const}` on async values read inside closures ([#18533](sveltejs/svelte#18533))

- fix: avoid css tree-shaking for exported Snippet ([#18540](sveltejs/svelte#18540))

- perf: treat `<img loading>` as a static element again ([#18711](sveltejs/svelte#18711))

- fix: prevent `selectedcontent` mutation from changing the selected option ([#18495](sveltejs/svelte#18495))

- fix: avoid `NaN` keyframe values in `slide` transition for elements without a layout box ([#18430](sveltejs/svelte#18430))

- fix: preserve line feed character references in attribute values ([#18691](sveltejs/svelte#18691))

- fix: decode uppercase-`X` hex numeric character references (`&#X...;`) ([#18708](sveltejs/svelte#18708))

- chore: clarify when `$effect.pre` runs relative to DOM updates ([#18534](sveltejs/svelte#18534))

- fix: scope SSR boundary failed snippets to their boundary ([#18593](sveltejs/svelte#18593))
renovate Bot added a commit to cigaleapp/cigale that referenced this pull request Sep 7, 2026
@renovate
⬆️ Update dependency svelte to ^5.57.0
fbf8317 
##### [v5.57.0](https://github.com/sveltejs/svelte/blob/HEAD/packages/svelte/CHANGELOG.md#5570)

##### Minor Changes

- feat: export `RenderOutput`, `SyncRenderOutput`, `Csp` and `Sha256Source` from `svelte/server` ([#18648](sveltejs/svelte#18648))

- feat: add `has` function to `createContext` ([#18472](sveltejs/svelte#18472))

- feat: support `defaultValue` on `<select>` ([#18591](sveltejs/svelte#18591))

- feat: add getOrInsert/getOrInsertComputed to SvelteMap ([#18728](sveltejs/svelte#18728))

##### Patch Changes

- fix: block template store subscriptions on the promise that assigns the store ([#18582](sveltejs/svelte#18582))

- fix: route $derived teardown errors through invoke\_error\_boundary ([#18486](sveltejs/svelte#18486))

- fix: track SvelteDate snapshots in reactions ([#18700](sveltejs/svelte#18700))

- fix: remove `<svelte:head>` anchors on unmount ([#18697](sveltejs/svelte#18697))

- fix: warn on undeclared shorthand event handlers on `<svelte:window>`, `<svelte:document>` and `<svelte:body>` ([#18480](sveltejs/svelte#18480))

- perf: reuse the cached value in the `<option>`/`<select>` value guard ([#18713](sveltejs/svelte#18713))

- fix: prevent malformed AST output for `<select>` with static `value` attribute ([#18449](sveltejs/svelte#18449))

- fix: apply ownership mutation ignores to binding assignments ([#18718](sveltejs/svelte#18718))

- fix: prevent onoutroend from firing twice when compilerOptions.hmr is true ([#18655](sveltejs/svelte#18655))

- fix: preserve whitespace after inline elements when printing ([#18685](sveltejs/svelte#18685))

- perf: fold SSR block-open markers into the branch's first push ([#18712](sveltejs/svelte#18712))

- fix: run `onDestroy` callbacks when a server render throws ([#18585](sveltejs/svelte#18585))

- fix: report `derived_invalid_export` for `export let x = $derived(...)` in runes mode ([#18692](sveltejs/svelte#18692))

- fix: never apply class hash to elements inside `<svelte:head>` ([#18160](sveltejs/svelte#18160))

- fix: keep `defaultChecked` on hydrated radio inputs with spread attributes ([#18701](sveltejs/svelte#18701))

- fix: accept `onfocusin`/`onfocusout` in `a11y_mouse_events_have_key_events` ([#18689](sveltejs/svelte#18689))

- perf: O(n²)→O(n) Map lookups for legacy `$:` reactive statement ordering ([#18602](sveltejs/svelte#18602))

- fix: distinct memoizer on style/class directives ([#18466](sveltejs/svelte#18466))

- fix: measure nested transitions before applying their starting styles ([#18647](sveltejs/svelte#18647))

- fix: don't turn component instances stored in `$state` into state proxies ([#18646](sveltejs/svelte#18646))

- perf: emit `$.only_child` for elements with a single child ([#18717](sveltejs/svelte#18717))

- fix: omit `bind:focused` from SSR output (it has no HTML attribute) ([#18724](sveltejs/svelte#18724))

- fix: more robust rendering of Svelte custom element slots ([#18710](sveltejs/svelte#18710))

- perf: optimize simple object destructuring in `@const` tags ([#18390](sveltejs/svelte#18390))

- fix: properly apply static textarea value attribute during CSR ([#18727](sveltejs/svelte#18727))

- fix: end a restored reaction context at the end of its synchronous segment ([#18694](sveltejs/svelte#18694))

- fix: keep the dependencies of a reaction that throws, so deriveds it read are neither leaked nor stuck in their error ([#18703](sveltejs/svelte#18703))

- fix: don't resurrect outroing elements when an ancestor block is paused and resumed ([#18431](sveltejs/svelte#18431))

- perf: use `$.comment()` for single-comment templates ([#18714](sveltejs/svelte#18714))

- chore: move `@types/trusted-types` to devDependencies ([#18730](sveltejs/svelte#18730))

- perf: store setters cache as `Set` instead of `Array` ([#18251](sveltejs/svelte#18251))

- fix: transform derived assignments and select function bindings correctly during server-side rendering ([#18669](sveltejs/svelte#18669))

- fix: keep boolean attributes with an empty string value when rendering attribute objects on the server ([#18721](sveltejs/svelte#18721))

- fix: sync `SvelteURL` port signal when the protocol setter clears the port ([#18705](sveltejs/svelte#18705))

- fix: block declaration tags and `{@const}` on async values read inside closures ([#18533](sveltejs/svelte#18533))

- fix: avoid css tree-shaking for exported Snippet ([#18540](sveltejs/svelte#18540))

- perf: treat `<img loading>` as a static element again ([#18711](sveltejs/svelte#18711))

- fix: prevent `selectedcontent` mutation from changing the selected option ([#18495](sveltejs/svelte#18495))

- fix: avoid `NaN` keyframe values in `slide` transition for elements without a layout box ([#18430](sveltejs/svelte#18430))

- fix: preserve line feed character references in attribute values ([#18691](sveltejs/svelte#18691))

- fix: decode uppercase-`X` hex numeric character references (`&#X...;`) ([#18708](sveltejs/svelte#18708))

- chore: clarify when `$effect.pre` runs relative to DOM updates ([#18534](sveltejs/svelte#18534))

- fix: scope SSR boundary failed snippets to their boundary ([#18593](sveltejs/svelte#18593))
gwennlbh pushed a commit to cigaleapp/cigale that referenced this pull request Sep 7, 2026
@renovate
⬆️ Update dependency svelte to ^5.57.0 (#2144)
366a89e 
##### [v5.57.0](https://github.com/sveltejs/svelte/blob/HEAD/packages/svelte/CHANGELOG.md#5570)

##### Minor Changes

- feat: export `RenderOutput`, `SyncRenderOutput`, `Csp` and `Sha256Source` from `svelte/server` ([#18648](sveltejs/svelte#18648))

- feat: add `has` function to `createContext` ([#18472](sveltejs/svelte#18472))

- feat: support `defaultValue` on `<select>` ([#18591](sveltejs/svelte#18591))

- feat: add getOrInsert/getOrInsertComputed to SvelteMap ([#18728](sveltejs/svelte#18728))

##### Patch Changes

- fix: block template store subscriptions on the promise that assigns the store ([#18582](sveltejs/svelte#18582))

- fix: route $derived teardown errors through invoke\_error\_boundary ([#18486](sveltejs/svelte#18486))

- fix: track SvelteDate snapshots in reactions ([#18700](sveltejs/svelte#18700))

- fix: remove `<svelte:head>` anchors on unmount ([#18697](sveltejs/svelte#18697))

- fix: warn on undeclared shorthand event handlers on `<svelte:window>`, `<svelte:document>` and `<svelte:body>` ([#18480](sveltejs/svelte#18480))

- perf: reuse the cached value in the `<option>`/`<select>` value guard ([#18713](sveltejs/svelte#18713))

- fix: prevent malformed AST output for `<select>` with static `value` attribute ([#18449](sveltejs/svelte#18449))

- fix: apply ownership mutation ignores to binding assignments ([#18718](sveltejs/svelte#18718))

- fix: prevent onoutroend from firing twice when compilerOptions.hmr is true ([#18655](sveltejs/svelte#18655))

- fix: preserve whitespace after inline elements when printing ([#18685](sveltejs/svelte#18685))

- perf: fold SSR block-open markers into the branch's first push ([#18712](sveltejs/svelte#18712))

- fix: run `onDestroy` callbacks when a server render throws ([#18585](sveltejs/svelte#18585))

- fix: report `derived_invalid_export` for `export let x = $derived(...)` in runes mode ([#18692](sveltejs/svelte#18692))

- fix: never apply class hash to elements inside `<svelte:head>` ([#18160](sveltejs/svelte#18160))

- fix: keep `defaultChecked` on hydrated radio inputs with spread attributes ([#18701](sveltejs/svelte#18701))

- fix: accept `onfocusin`/`onfocusout` in `a11y_mouse_events_have_key_events` ([#18689](sveltejs/svelte#18689))

- perf: O(n²)→O(n) Map lookups for legacy `$:` reactive statement ordering ([#18602](sveltejs/svelte#18602))

- fix: distinct memoizer on style/class directives ([#18466](sveltejs/svelte#18466))

- fix: measure nested transitions before applying their starting styles ([#18647](sveltejs/svelte#18647))

- fix: don't turn component instances stored in `$state` into state proxies ([#18646](sveltejs/svelte#18646))

- perf: emit `$.only_child` for elements with a single child ([#18717](sveltejs/svelte#18717))

- fix: omit `bind:focused` from SSR output (it has no HTML attribute) ([#18724](sveltejs/svelte#18724))

- fix: more robust rendering of Svelte custom element slots ([#18710](sveltejs/svelte#18710))

- perf: optimize simple object destructuring in `@const` tags ([#18390](sveltejs/svelte#18390))

- fix: properly apply static textarea value attribute during CSR ([#18727](sveltejs/svelte#18727))

- fix: end a restored reaction context at the end of its synchronous segment ([#18694](sveltejs/svelte#18694))

- fix: keep the dependencies of a reaction that throws, so deriveds it read are neither leaked nor stuck in their error ([#18703](sveltejs/svelte#18703))

- fix: don't resurrect outroing elements when an ancestor block is paused and resumed ([#18431](sveltejs/svelte#18431))

- perf: use `$.comment()` for single-comment templates ([#18714](sveltejs/svelte#18714))

- chore: move `@types/trusted-types` to devDependencies ([#18730](sveltejs/svelte#18730))

- perf: store setters cache as `Set` instead of `Array` ([#18251](sveltejs/svelte#18251))

- fix: transform derived assignments and select function bindings correctly during server-side rendering ([#18669](sveltejs/svelte#18669))

- fix: keep boolean attributes with an empty string value when rendering attribute objects on the server ([#18721](sveltejs/svelte#18721))

- fix: sync `SvelteURL` port signal when the protocol setter clears the port ([#18705](sveltejs/svelte#18705))

- fix: block declaration tags and `{@const}` on async values read inside closures ([#18533](sveltejs/svelte#18533))

- fix: avoid css tree-shaking for exported Snippet ([#18540](sveltejs/svelte#18540))

- perf: treat `<img loading>` as a static element again ([#18711](sveltejs/svelte#18711))

- fix: prevent `selectedcontent` mutation from changing the selected option ([#18495](sveltejs/svelte#18495))

- fix: avoid `NaN` keyframe values in `slide` transition for elements without a layout box ([#18430](sveltejs/svelte#18430))

- fix: preserve line feed character references in attribute values ([#18691](sveltejs/svelte#18691))

- fix: decode uppercase-`X` hex numeric character references (`&#X...;`) ([#18708](sveltejs/svelte#18708))

- chore: clarify when `$effect.pre` runs relative to DOM updates ([#18534](sveltejs/svelte#18534))

- fix: scope SSR boundary failed snippets to their boundary ([#18593](sveltejs/svelte#18593))

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
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Nested Transitions Regression

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@61021 @dummdidumm