From a858f94bb7ba4b57c4ec4decedb6fca8a819a869 Mon Sep 17 00:00:00 2001
From: th <th@skilleven.de>
Date: Fri, 24 Apr 2026 12:26:57 +0200
Subject: [PATCH] 0.17.0: split SVG layer into per-path layers

Right-click an SVG-backed layer to split it into one layer per
top-level drawable. Each part keeps the original stage position
and ends up as a same-size standalone SVG.

Also: delete confirm now floats above the welcome dialog (topmost
z-index + scoped ESC/Tab via modal stack) and autofocuses its
primary button so Enter triggers confirm instead of bubbling back
to the underlying row.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---
 package.json                      |   2 +-
 src/components/Timeline.vue       |  30 ++
 src/components/WelcomeDialog.vue  |  31 +-
 src/components/ui/DialogsHost.vue |  10 +
 src/components/ui/Modal.vue       |  51 ++-
 src/devtools/tests.ts             | 542 ++++++++++++++++++++++++++----
 src/i18n/messages.ts              |   1 +
 src/lib/svgSplit.ts               | 150 +++++++++
 src/stores/scene.ts               | 152 +++++++++
 src/version.ts                    |   2 +-
 10 files changed, 887 insertions(+), 84 deletions(-)
 create mode 100644 src/lib/svgSplit.ts

diff --git a/package.json b/package.json
index de37f3a..ab2782d 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "ruwio",
   "private": true,
-  "version": "0.16.1",
+  "version": "0.17.0",
   "type": "module",
   "scripts": {
     "dev": "vite",
diff --git a/src/components/Timeline.vue b/src/components/Timeline.vue
index 6226321..d8b9afe 100644
--- a/src/components/Timeline.vue
+++ b/src/components/Timeline.vue
@@ -24,6 +24,7 @@ import {
   PhPencilSimpleLine,
   PhPlus,
   PhPolygon,
+  PhScissors,
   PhSpeakerSlash,
   PhSquare,
   PhTextT,
@@ -2683,6 +2684,26 @@ function convertSelectedToClipFromMenu() {
   trackMenu.value = null
 }
 
+/** True only for a context-menu tied to an SVG-backed image layer.
+ *  Gates the "Split SVG" entry so the menu doesn't show a dead action
+ *  on raster layers. */
+const canSplitSvgFromMenu = computed(() => {
+  const m = trackMenu.value
+  if (!m || m.kind !== 'layer') return false
+  const layer = store.scene.layers.find((l) => l.id === m.trackId)
+  if (!layer) return false
+  const asset = store.scene.assets.find((a) => a.id === layer.assetId)
+  if (!asset || asset.kind !== 'image') return false
+  return asset.src.startsWith('data:image/svg+xml')
+})
+
+function splitSvgFromMenu() {
+  const m = trackMenu.value
+  if (!m || m.kind !== 'layer') return
+  store.splitLayerSvg(m.trackId)
+  trackMenu.value = null
+}
+
 function deleteTrack() {
   if (!trackMenu.value) return
   if (trackMenu.value.kind === 'layer') {
@@ -3976,6 +3997,15 @@ onBeforeUnmount(() => {
             <PhFilmStrip :size="12" class="kf-menu-icon" />
             {{ t('timeline.convertToClip', { n: store.selectedLayerIds.length }) }}
           </button>
+          <button
+            v-if="canSplitSvgFromMenu"
+            class="kf-menu-item"
+            :disabled="trackMenu.locked"
+            @click="splitSvgFromMenu"
+          >
+            <PhScissors :size="12" class="kf-menu-icon" />
+            {{ t('timeline.splitSvg') }}
+          </button>
         </template>
       </template>
       <template v-if="trackMenu.kind !== 'group'">
diff --git a/src/components/WelcomeDialog.vue b/src/components/WelcomeDialog.vue
index f6a05ba..dbc73f3 100644
--- a/src/components/WelcomeDialog.vue
+++ b/src/components/WelcomeDialog.vue
@@ -103,11 +103,18 @@ function onRecentKeyDown(e: KeyboardEvent, index: number) {
   } else if (e.key === 'End') {
     e.preventDefault()
     focusRecent(recentRefs.value.length - 1)
+  } else if (e.key === 'Backspace' || e.key === 'Delete') {
+    e.preventDefault()
+    const p = recents.value[index]
+    if (p) void deleteRecentWithConfirm(p, index)
   }
 }
 
-async function removeProject(e: MouseEvent, p: StoredProject) {
-  e.stopPropagation()
+/** Wrap the usual trash-icon flow so the keyboard path stays in lock-
+ *  step with the mouse one: same confirm dialog, same reload after,
+ *  and focus lands on a sensible neighbour instead of the now-empty
+ *  slot. */
+async function deleteRecentWithConfirm(p: StoredProject, index: number) {
   const ok = await confirmDialog({
     title: t('welcome.deleteDialog.title'),
     message: t('welcome.deleteDialog.message', { name: p.name }),
@@ -117,6 +124,19 @@ async function removeProject(e: MouseEvent, p: StoredProject) {
   if (!ok) return
   await deleteStoredProject(p.id)
   await reload()
+  // After reload the recentRefs have been rebuilt. Keep focus close
+  // to where the user was: the slot now occupied by the next entry,
+  // or the previous one if we deleted the tail.
+  await nextTick()
+  const remaining = recentRefs.value.length
+  if (remaining === 0) return
+  focusRecent(Math.min(index, remaining - 1))
+}
+
+async function removeProject(e: MouseEvent, p: StoredProject) {
+  e.stopPropagation()
+  const index = recents.value.findIndex((x) => x.id === p.id)
+  await deleteRecentWithConfirm(p, index >= 0 ? index : 0)
 }
 
 function startFresh() {
@@ -234,10 +254,13 @@ watch(
   color: var(--text-dim);
 }
 
+/* Padding only — scrolling is delegated to Modal's own `.body`, which
+   carries the flex + overflow rules that actually cap the dialog at
+   viewport height. Adding an extra overflow layer here swallowed the
+   wheel events because this inner wrapper had no height constraint
+   and never became its own scroll container. */
 .body {
   padding: 8px 12px;
-  overflow: auto;
-  flex: 1;
 }
 
 .empty {
diff --git a/src/components/ui/DialogsHost.vue b/src/components/ui/DialogsHost.vue
index a62084c..4d616de 100644
--- a/src/components/ui/DialogsHost.vue
+++ b/src/components/ui/DialogsHost.vue
@@ -19,6 +19,7 @@ const open = computed({
 
 const inputValue = ref('')
 const inputEl = ref<HTMLInputElement | null>(null)
+const primaryBtn = ref<HTMLButtonElement | null>(null)
 
 watch(
   () => current.value,
@@ -28,6 +29,13 @@ watch(
       await nextTick()
       inputEl.value?.focus()
       inputEl.value?.select()
+    } else if (s?.kind === 'confirm') {
+      // Move focus to the confirm button so Enter triggers confirm
+      // natively. Without this, focus stays on whatever opened the
+      // dialog (e.g. a welcome-dialog recent row) and Enter bubbles
+      // back to its handler instead.
+      await nextTick()
+      primaryBtn.value?.focus()
     }
   },
   { immediate: true },
@@ -74,6 +82,7 @@ function isDanger(): boolean {
     :model-value="open"
     :title="title()"
     size="sm"
+    topmost
     @update:model-value="open = $event"
   >
     <div v-if="current?.kind === 'confirm'" class="body confirm-body">
@@ -98,6 +107,7 @@ function isDanger(): boolean {
     <template #footer>
       <button class="btn secondary" @click="onCancel">{{ cancelLabel() }}</button>
       <button
+        ref="primaryBtn"
         class="btn primary"
         :class="{ danger: isDanger() }"
         @click="onConfirm"
diff --git a/src/components/ui/Modal.vue b/src/components/ui/Modal.vue
index 330555f..e4c0653 100644
--- a/src/components/ui/Modal.vue
+++ b/src/components/ui/Modal.vue
@@ -1,11 +1,17 @@
 <script setup lang="ts">
-import { onBeforeUnmount, onMounted, ref } from 'vue'
+import { onBeforeUnmount, onMounted, ref, watch } from 'vue'
 import type { StyleValue } from 'vue'
 import { PhX } from '@phosphor-icons/vue'
 import { t } from '@/i18n'
 
 type Size = 'sm' | 'md' | 'lg' | 'xl'
 
+// Module-level open-modal stack — LIFO. Only the most recently opened
+// modal claims ESC; anything underneath (welcome while a confirm is
+// up) ignores the key so it doesn't double-dismiss.
+const modalStack: symbol[] = []
+const modalId = Symbol('modal')
+
 const props = withDefaults(
   defineProps<{
     modelValue: boolean
@@ -16,6 +22,10 @@ const props = withDefaults(
     dismissable?: boolean
     dialogStyle?: StyleValue
     bodyStyle?: StyleValue
+    /** Raise the backdrop + dialog above any other Modal currently on
+     *  screen. Used by confirm/prompt dialogs that pop ON TOP of other
+     *  modals (welcome screen → delete confirm, etc.). */
+    topmost?: boolean
   }>(),
   {
     size: 'md',
@@ -24,6 +34,7 @@ const props = withDefaults(
     dismissable: true,
     dialogStyle: undefined,
     bodyStyle: undefined,
+    topmost: false,
   },
 )
 
@@ -86,24 +97,50 @@ function handleTab(e: KeyboardEvent) {
 
 function onKeyDown(e: KeyboardEvent) {
   if (!props.modelValue) return
-  if (e.key === 'Escape' && props.closeOnEsc) {
+  // Only the topmost modal owns ESC. `modalStack[last]` is whichever
+  // Modal most recently flipped to open; non-topmost ones below it
+  // stay put.
+  const isTop = modalStack[modalStack.length - 1] === modalId
+  if (e.key === 'Escape' && props.closeOnEsc && isTop) {
     e.preventDefault()
     close()
     return
   }
-  if (e.key === 'Tab') {
+  if (e.key === 'Tab' && isTop) {
     handleTab(e)
   }
 }
 
+watch(
+  () => props.modelValue,
+  (v) => {
+    if (v) {
+      modalStack.push(modalId)
+    } else {
+      const i = modalStack.indexOf(modalId)
+      if (i >= 0) modalStack.splice(i, 1)
+    }
+  },
+  { immediate: true },
+)
+
 onMounted(() => document.addEventListener('keydown', onKeyDown))
-onBeforeUnmount(() => document.removeEventListener('keydown', onKeyDown))
+onBeforeUnmount(() => {
+  document.removeEventListener('keydown', onKeyDown)
+  const i = modalStack.indexOf(modalId)
+  if (i >= 0) modalStack.splice(i, 1)
+})
 </script>
 
 <template>
   <Teleport to="body">
     <Transition name="modal-fade">
-      <div v-if="modelValue" class="backdrop" @mousedown="onBackdropMouseDown">
+      <div
+        v-if="modelValue"
+        class="backdrop"
+        :class="{ topmost }"
+        @mousedown="onBackdropMouseDown"
+      >
         <div
           ref="dialogRef"
           class="dialog"
@@ -150,6 +187,10 @@ onBeforeUnmount(() => document.removeEventListener('keydown', onKeyDown))
   backdrop-filter: blur(2px);
 }
 
+.backdrop.topmost {
+  z-index: 1000;
+}
+
 .dialog {
   background: var(--panel);
   border: 1px solid var(--border-strong);
diff --git a/src/devtools/tests.ts b/src/devtools/tests.ts
index 1ecff7b..dd14a5b 100644
--- a/src/devtools/tests.ts
+++ b/src/devtools/tests.ts
@@ -1365,28 +1365,26 @@ export function registerAllTests(): void {
       // Silence actual file downloads during the test.
       const originalClick = HTMLAnchorElement.prototype.click
       HTMLAnchorElement.prototype.click = function () {}
-
       const baseline = snapshotDialogs()
       const handle = mountComponent(ExportDialog, { modelValue: true })
-      await nextTick()
-      const dialog = dialogsAddedSince(baseline)[0]
-      const btn = findOptionByTitle(dialog, i18nT('export.apngPreviewTitle'))
-      expect(btn).toBeTruthy()
-      btn!.click()
-      await nextTick()
-      // Progress view replaces the options list — `.rendering` appears,
-      // `.opt` buttons vanish.
-      const rendering = dialog.querySelector('.rendering') as HTMLElement | null
-      expect(rendering).toBeTruthy()
-      const label = dialog.querySelector('.r-text')?.textContent ?? ''
-      expect(label).toBe(i18nT('export.labelApngPreview'))
-      // Abort the pending render so the encoder doesn't burn CPU for
-      // the rest of the test run.
-      const cancelBtn = dialog.querySelector('.r-actions button') as HTMLButtonElement | null
-      cancelBtn?.click()
-      await nextTick()
-      HTMLAnchorElement.prototype.click = originalClick
-      handle.unmount()
+      try {
+        await nextTick()
+        const dialog = dialogsAddedSince(baseline)[0]
+        const btn = findOptionByTitle(dialog, i18nT('export.apngPreviewTitle'))
+        expect(btn).toBeTruthy()
+        btn!.click()
+        await nextTick()
+        const rendering = dialog.querySelector('.rendering') as HTMLElement | null
+        expect(rendering).toBeTruthy()
+        const label = dialog.querySelector('.r-text')?.textContent ?? ''
+        expect(label).toBe(i18nT('export.labelApngPreview'))
+        const cancelBtn = dialog.querySelector('.r-actions button') as HTMLButtonElement | null
+        cancelBtn?.click()
+        await nextTick()
+      } finally {
+        HTMLAnchorElement.prototype.click = originalClick
+        handle.unmount()
+      }
     })
   })
 
@@ -2368,40 +2366,35 @@ export function registerAllTests(): void {
       await saveProjectToStore(s.project, { id: idA, name: 'A' })
       await tick(5)
       await saveProjectToStore(s.project, { id: idB, name: 'B' })
-
       const baseline = snapshotDialogs()
       const handle = mountComponent(WelcomeDialog, { modelValue: true })
-      // Wait for the dialog's async reload() to populate the list.
-      await waitUntil(() => {
-        const d = dialogsAddedSince(baseline)[0]
-        return !!d && d.querySelectorAll('.recent').length >= 2
-      })
-      const dialog = dialogsAddedSince(baseline)[0]
-      expect(dialog).toBeTruthy()
-      const items = dialog.querySelectorAll('.recent') as NodeListOf<HTMLElement>
-      expect(items.length >= 2).toBe(true)
+      try {
+        await waitUntil(() => {
+          const d = dialogsAddedSince(baseline)[0]
+          return !!d && d.querySelectorAll('.recent').length >= 2
+        })
+        const dialog = dialogsAddedSince(baseline)[0]
+        expect(dialog).toBeTruthy()
+        const items = dialog.querySelectorAll('.recent') as NodeListOf<HTMLElement>
+        expect(items.length >= 2).toBe(true)
 
-      // The initial focus should already be on the first recent.
-      items[0].focus()
-      expect(document.activeElement).toBe(items[0])
-
-      // ArrowDown moves to the next item.
-      items[0].dispatchEvent(
-        new KeyboardEvent('keydown', { key: 'ArrowDown', bubbles: true }),
-      )
-      await nextTick()
-      expect(document.activeElement).toBe(items[1])
-
-      // ArrowUp moves back.
-      items[1].dispatchEvent(
-        new KeyboardEvent('keydown', { key: 'ArrowUp', bubbles: true }),
-      )
-      await nextTick()
-      expect(document.activeElement).toBe(items[0])
-
-      handle.unmount()
-      await deleteStoredProject(idA)
-      await deleteStoredProject(idB)
+        items[0].focus()
+        expect(document.activeElement).toBe(items[0])
+        items[0].dispatchEvent(
+          new KeyboardEvent('keydown', { key: 'ArrowDown', bubbles: true }),
+        )
+        await nextTick()
+        expect(document.activeElement).toBe(items[1])
+        items[1].dispatchEvent(
+          new KeyboardEvent('keydown', { key: 'ArrowUp', bubbles: true }),
+        )
+        await nextTick()
+        expect(document.activeElement).toBe(items[0])
+      } finally {
+        handle.unmount()
+        await deleteStoredProject(idA).catch(() => {})
+        await deleteStoredProject(idB).catch(() => {})
+      }
     })
 
     test('Home and End jump to the first / last recent', async () => {
@@ -2415,34 +2408,236 @@ export function registerAllTests(): void {
         await saveProjectToStore(s.project, { id, name: id })
         await tick(5)
       }
-
       const baseline = snapshotDialogs()
       const handle = mountComponent(WelcomeDialog, { modelValue: true })
-      await waitUntil(() => {
-        const d = dialogsAddedSince(baseline)[0]
-        return !!d && d.querySelectorAll('.recent').length >= 3
+      try {
+        await waitUntil(() => {
+          const d = dialogsAddedSince(baseline)[0]
+          return !!d && d.querySelectorAll('.recent').length >= 3
+        })
+        const dialog = dialogsAddedSince(baseline)[0]
+        const items = dialog.querySelectorAll('.recent') as NodeListOf<HTMLElement>
+        expect(items.length >= 3).toBe(true)
+
+        items[1].focus()
+        items[1].dispatchEvent(
+          new KeyboardEvent('keydown', { key: 'End', bubbles: true }),
+        )
+        await nextTick()
+        expect(document.activeElement).toBe(items[items.length - 1])
+        items[items.length - 1].dispatchEvent(
+          new KeyboardEvent('keydown', { key: 'Home', bubbles: true }),
+        )
+        await nextTick()
+        expect(document.activeElement).toBe(items[0])
+      } finally {
+        handle.unmount()
+        for (const id of ids) await deleteStoredProject(id).catch(() => {})
+      }
+    })
+
+    test('Enter on a focused recent opens the project (when no confirm is up)', async () => {
+      // Regression guard: Enter must open the focused project while
+      // the welcome is the active modal. Delete-confirm (next test)
+      // verifies that Enter doesn't leak through to this handler while
+      // the confirm is on top.
+      const s = makeFreshStore()
+      const idA = `test-enter-a-${Date.now()}`
+      await saveProjectToStore(s.project, { id: idA, name: 'Open me' })
+      const baseline = snapshotDialogs()
+      let opened: { name: string } | null = null
+      const handle = mountComponent(WelcomeDialog, {
+        modelValue: true,
+        'onOpen': (p: { name: string }) => {
+          opened = p
+        },
       })
-      const dialog = dialogsAddedSince(baseline)[0]
-      const items = dialog.querySelectorAll('.recent') as NodeListOf<HTMLElement>
-      expect(items.length >= 3).toBe(true)
+      try {
+        await waitUntil(() => {
+          const d = dialogsAddedSince(baseline)[0]
+          return !!d && d.querySelectorAll('.recent').length >= 1
+        })
+        const welcome = dialogsAddedSince(baseline)[0]
+        const top = welcome.querySelectorAll('.recent')[0] as HTMLElement
+        top.focus()
+        top.dispatchEvent(
+          new KeyboardEvent('keydown', { key: 'Enter', bubbles: true, cancelable: true }),
+        )
+        await nextTick()
+        expect(opened).toBeTruthy()
+      } finally {
+        handle.unmount()
+        await deleteStoredProject(idA).catch(() => {})
+      }
+    })
 
-      // Start somewhere in the middle, then End jumps to the last.
-      items[1].focus()
-      items[1].dispatchEvent(
-        new KeyboardEvent('keydown', { key: 'End', bubbles: true }),
-      )
-      await nextTick()
-      expect(document.activeElement).toBe(items[items.length - 1])
+    test('Enter while the delete-confirm is up triggers confirm (not openProject)', async () => {
+      // After Backspace pops the confirm, focus must move to the
+      // confirm button so the next Enter fires its click instead of
+      // bubbling back to the welcome row and opening the project.
+      const s = makeFreshStore()
+      const idA = `test-enter-confirm-a-${Date.now()}`
+      const idB = `test-enter-confirm-b-${Date.now()}`
+      await saveProjectToStore(s.project, { id: idA, name: 'Keep' })
+      await tick(5)
+      await saveProjectToStore(s.project, { id: idB, name: 'DropMe' })
+      const baseline = snapshotDialogs()
+      let openCalls = 0
+      const handle = mountComponent(WelcomeDialog, {
+        modelValue: true,
+        'onOpen': () => {
+          openCalls += 1
+        },
+      })
+      try {
+        await waitUntil(() => {
+          const d = dialogsAddedSince(baseline)[0]
+          return !!d && d.querySelectorAll('.recent').length >= 2
+        })
+        const welcome = dialogsAddedSince(baseline)[0]
+        // The newest seed ('DropMe' / idB) is at the top of the list.
+        // We assert by name rather than by count because the browser's
+        // IDB may already hold MAX_RECENT real projects; in that case
+        // deleting the top entry just unmasks a hidden record and the
+        // count stays the same even though the seed is gone.
+        const top = welcome.querySelectorAll('.recent')[0] as HTMLElement
+        top.focus()
+        top.dispatchEvent(
+          new KeyboardEvent('keydown', { key: 'Backspace', bubbles: true }),
+        )
+        await waitUntil(() => !!document.querySelector('.backdrop.topmost'))
+        // Confirm dialog is up; focus should now be on its primary
+        // button so Enter fires the confirm instead of bubbling back
+        // to the welcome row's Enter handler (which would openProject).
+        const topmost = document.querySelector('.backdrop.topmost') as HTMLElement
+        const primary = topmost.querySelector('footer .btn.primary') as HTMLButtonElement
+        await waitUntil(() => document.activeElement === primary)
+        expect(document.activeElement).toBe(primary)
+        primary.dispatchEvent(
+          new KeyboardEvent('keydown', { key: 'Enter', bubbles: true, cancelable: true }),
+        )
+        // Native browser behaviour: Enter on a focused button synthesises
+        // a click. Simulate that click directly to keep jsdom/Chrome
+        // behaviour consistent inside the test.
+        primary.click()
+        await waitUntil(() => !welcome.textContent?.includes('DropMe'))
+        expect(welcome.textContent?.includes('DropMe')).toBe(false)
+        // The welcome's openProject handler must NOT have fired.
+        expect(openCalls).toBe(0)
+      } finally {
+        handle.unmount()
+        await deleteStoredProject(idA).catch(() => {})
+        await deleteStoredProject(idB).catch(() => {})
+      }
+    })
 
-      // Home returns to the first.
-      items[items.length - 1].dispatchEvent(
-        new KeyboardEvent('keydown', { key: 'Home', bubbles: true }),
-      )
-      await nextTick()
-      expect(document.activeElement).toBe(items[0])
+    test('Backspace on a focused recent opens the confirm and removes it on OK', async () => {
+      // Seed two recents; mount welcome; focus the top one; press
+      // Backspace. A confirm dialog is expected to pop (topmost layer),
+      // and clicking OK should drop the entry from the welcome list.
+      const s = makeFreshStore()
+      const idA = `test-backspace-a-${Date.now()}`
+      const idB = `test-backspace-b-${Date.now()}`
+      await saveProjectToStore(s.project, { id: idA, name: 'Keep' })
+      await tick(5)
+      await saveProjectToStore(s.project, { id: idB, name: 'DropMe' })
+      const baseline = snapshotDialogs()
+      const handle = mountComponent(WelcomeDialog, { modelValue: true })
+      try {
+        await waitUntil(() => {
+          const d = dialogsAddedSince(baseline)[0]
+          return !!d && d.querySelectorAll('.recent').length >= 2
+        })
+        const welcome = dialogsAddedSince(baseline)[0]
+        // Assert by seed name rather than count — MAX_RECENT caps the
+        // visible list at 8, so if the browser's IDB already has enough
+        // real projects, deleting the top seed just unmasks a hidden
+        // record and the count does not drop.
+        const top = welcome.querySelectorAll('.recent')[0] as HTMLElement
+        top.focus()
+        expect(document.activeElement).toBe(top)
+        top.dispatchEvent(
+          new KeyboardEvent('keydown', { key: 'Backspace', bubbles: true }),
+        )
+        await waitUntil(() => !!document.querySelector('.backdrop.topmost'))
+        const topmost = document.querySelector('.backdrop.topmost') as HTMLElement
+        const confirmBtn = topmost.querySelector('footer .btn.primary') as HTMLButtonElement
+        expect(confirmBtn).toBeTruthy()
+        confirmBtn.click()
+        // reload() briefly flips loading=true, which hides .recents
+        // behind the .empty "loading…" placeholder and also unmounts
+        // the <li>s (so 'DropMe' is transiently absent from textContent
+        // too). Wait for the list to fully settle before asserting.
+        await waitUntil(
+          () =>
+            !welcome.textContent?.includes('DropMe') &&
+            !!welcome.querySelector('.recents'),
+        )
+        expect(welcome.textContent?.includes('DropMe')).toBe(false)
+        // Focus is placed by deleteRecentWithConfirm AFTER reload
+        // returns, so poll until it lands inside welcome.
+        await waitUntil(() => welcome.contains(document.activeElement))
+        expect(welcome.contains(document.activeElement)).toBe(true)
+      } finally {
+        handle.unmount()
+        await deleteStoredProject(idA).catch(() => {})
+        await deleteStoredProject(idB).catch(() => {})
+      }
+    })
 
-      handle.unmount()
-      for (const id of ids) await deleteStoredProject(id)
+    test('delete confirm floats above the welcome dialog and the list updates afterwards', async () => {
+      // Reproduces: clicking the trash icon used to pop the confirm
+      // behind welcome (both z-index 900); pressing ESC then dismissed
+      // welcome as well because both modals ate the key. The topmost
+      // flag fixes stacking and the stack-based ESC filter keeps the
+      // confirm from dragging welcome down with it.
+      const s = makeFreshStore()
+      const idA = `test-del-a-${Date.now()}`
+      const idB = `test-del-b-${Date.now()}`
+      await saveProjectToStore(s.project, { id: idA, name: 'Keep' })
+      await tick(5)
+      await saveProjectToStore(s.project, { id: idB, name: 'DropMe' })
+      const baseline = snapshotDialogs()
+      const handle = mountComponent(WelcomeDialog, { modelValue: true })
+      try {
+        await waitUntil(() => {
+          const d = dialogsAddedSince(baseline)[0]
+          return !!d && d.querySelectorAll('.recent').length >= 2
+        })
+        const welcome = dialogsAddedSince(baseline)[0]
+        expect(welcome).toBeTruthy()
+        expect(welcome.querySelectorAll('.recent').length >= 2).toBe(true)
+
+        const target = welcome.querySelectorAll('.recent')[0] as HTMLElement
+        const delBtn = target.querySelector('.del') as HTMLButtonElement
+        expect(delBtn).toBeTruthy()
+        delBtn.click()
+        await waitUntil(() => !!document.querySelector('.backdrop.topmost'))
+        const topmost = document.querySelector('.backdrop.topmost') as HTMLElement
+        expect(topmost).toBeTruthy()
+        const confirmBtn = topmost.querySelector(
+          'footer .btn.primary',
+        ) as HTMLButtonElement
+        expect(confirmBtn).toBeTruthy()
+        confirmBtn.click()
+        // Assert by seed name rather than count — MAX_RECENT=8 caps the
+        // visible list, so deleting the top seed may just unmask a
+        // hidden record instead of dropping the total. Also wait for
+        // the list to rerender: reload() briefly flips loading=true,
+        // which hides .recents behind the "loading…" placeholder.
+        await waitUntil(
+          () =>
+            !welcome.textContent?.includes('DropMe') &&
+            !!welcome.querySelector('.recents'),
+        )
+        expect(welcome.textContent?.includes('DropMe')).toBe(false)
+        expect(welcome.isConnected).toBe(true)
+        expect(welcome.querySelector('.recents')).toBeTruthy()
+      } finally {
+        handle.unmount()
+        await deleteStoredProject(idA).catch(() => {})
+        await deleteStoredProject(idB).catch(() => {})
+      }
     })
   })
 
@@ -4106,6 +4301,129 @@ export function registerAllTests(): void {
     })
   })
 
+  suite('svg split', () => {
+    // A minimal SVG with two non-overlapping paths. Absolute
+    // coordinates so getBBox returns predictable values under jsdom/
+    // Chrome. The split helper should emit two standalone SVG parts.
+    const sampleSvg = `<svg xmlns="http://www.w3.org/2000/svg" width="100" height="60" viewBox="0 0 100 60">
+  <rect id="left" x="0" y="0" width="40" height="40" fill="#f00" />
+  <rect id="right" x="60" y="20" width="40" height="40" fill="#0f0" />
+</svg>`
+
+    function toDataUrl(svg: string): string {
+      return 'data:image/svg+xml,' + encodeURIComponent(svg)
+    }
+
+    test('splitSvg returns one part per top-level drawable', async () => {
+      const { splitSvg } = await import('@/lib/svgSplit')
+      const out = splitSvg(sampleSvg)
+      expect(out).toBeTruthy()
+      expect(out!.parts.length).toBe(2)
+      expect(out!.parts[0].svgText).toContain('<rect')
+      expect(out!.parts[0].svgText).toContain('id="left"')
+      // Each part keeps the ORIGINAL width/height/viewBox so the store
+      // can reuse the layer's position without any geometry math.
+      expect(out!.parts[0].svgText).toContain('width="100"')
+      expect(out!.parts[0].svgText).toContain('viewBox="0 0 100 60"')
+      expect(out!.parts[0].dataUrl.startsWith('data:image/svg+xml')).toBe(true)
+    })
+
+    test('splitSvg returns null for a single-element SVG (nothing to split)', async () => {
+      const { splitSvg } = await import('@/lib/svgSplit')
+      const one = `<svg xmlns="http://www.w3.org/2000/svg" width="40" height="40" viewBox="0 0 40 40"><rect width="40" height="40" fill="#333"/></svg>`
+      expect(splitSvg(one)).toBeNull()
+    })
+
+    test('splitSvg data URLs keep # encoded so hex colours survive (regression)', async () => {
+      // A raw `#` in the data URL is parsed as a fragment separator
+      // by every browser, which truncates the SVG at the first colour
+      // value. The encoder has to leave `#` percent-encoded even
+      // though it makes the URL a bit longer.
+      const { splitSvg } = await import('@/lib/svgSplit')
+      const out = splitSvg(sampleSvg)
+      expect(out).toBeTruthy()
+      for (const p of out!.parts) {
+        // The payload portion (after the comma) must NOT contain a
+        // literal `#` — otherwise browsers load a truncated SVG.
+        const payload = p.dataUrl.slice(p.dataUrl.indexOf(',') + 1)
+        expect(payload.includes('#')).toBe(false)
+        // It should still encode the hex colour:
+        expect(payload.includes('%23')).toBe(true)
+      }
+    })
+
+    test('splitLayerSvg replaces the original layer with one layer per part at the same stage position', () => {
+      const s = makeFreshStore()
+      const asset = s.addAsset({
+        kind: 'image',
+        name: 'SvgSrc',
+        src: toDataUrl(sampleSvg),
+        width: 100,
+        height: 60,
+      })
+      const l = s.addLayer(asset.id)!
+      const origX = l.base.x
+      const origY = l.base.y
+      const result = s.splitLayerSvg(l.id)
+      expect(result).toBeTruthy()
+      expect(result!.length).toBe(2)
+      // Original layer is gone.
+      expect(s.scene.layers.find((x) => x.id === l.id)).toBe(undefined)
+      // Both new layers exist and sit on top of the old layer's stage
+      // position — each part's SVG canvas is the same size as the
+      // original so no delta is needed.
+      const [a, b] = result!.map((id) => s.scene.layers.find((x) => x.id === id)!)
+      expect(a.base.x).toBe(origX)
+      expect(a.base.y).toBe(origY)
+      expect(b.base.x).toBe(origX)
+      expect(b.base.y).toBe(origY)
+      // New assets carry the full original dimensions.
+      const assetA = s.scene.assets.find(
+        (x) => x.id === a.assetId,
+      ) as Extract<typeof s.scene.assets[number], { kind: 'image' }>
+      expect(assetA.width).toBe(100)
+      expect(assetA.height).toBe(60)
+      // New parts replace the original in trackOrder at its original slot.
+      const order = s.scene.trackOrder ?? []
+      expect(order.includes(l.id)).toBe(false)
+      for (const id of result!) expect(order.includes(id)).toBe(true)
+    })
+
+    test('splitLayerSvg clones keyframes verbatim (no x/y drift)', () => {
+      const s = makeFreshStore()
+      const asset = s.addAsset({
+        kind: 'image',
+        name: 'Anim',
+        src: toDataUrl(sampleSvg),
+        width: 100,
+        height: 60,
+      })
+      const l = s.addLayer(asset.id)!
+      s.upsertKeyframe(l.id, 1, { x: 200, y: 120 })
+      const result = s.splitLayerSvg(l.id)
+      expect(result).toBeTruthy()
+      const first = s.scene.layers.find((x) => x.id === result![0])!
+      const kf = first.keyframes.find((k) => Math.abs(k.time - 1) < 1e-3)
+      expect(kf).toBeTruthy()
+      // Same x/y as the source keyframe; no shift math to go wrong.
+      expect(kf!.props.x).toBe(200)
+      expect(kf!.props.y).toBe(120)
+    })
+
+    test('splitLayerSvg returns null for a non-SVG image layer', () => {
+      const s = makeFreshStore()
+      const asset = s.addAsset({
+        kind: 'image',
+        name: 'Raster',
+        src: 'data:image/png;base64,iVBORw0K==',
+        width: 40,
+        height: 40,
+      })
+      const l = s.addLayer(asset.id)!
+      expect(s.splitLayerSvg(l.id)).toBeNull()
+    })
+  })
+
   suite('polygon — store actions', () => {
     function makePolygonLayer() {
       const s = makeFreshStore()
@@ -5761,6 +6079,84 @@ export function registerAllTests(): void {
     })
   })
 
+  suite('ui — Timeline split-svg menu entry', () => {
+    const sampleSvg = `<svg xmlns="http://www.w3.org/2000/svg" width="40" height="40" viewBox="0 0 40 40">
+  <rect x="0" y="0" width="20" height="20" fill="#f00"/>
+  <rect x="20" y="20" width="20" height="20" fill="#0f0"/>
+</svg>`
+
+    function toDataUrl(svg: string): string {
+      return 'data:image/svg+xml,' + encodeURIComponent(svg)
+    }
+
+    test('Split SVG entry appears in the track menu for an SVG-backed layer', async () => {
+      const s = makeFreshStore()
+      const asset = s.addAsset({
+        kind: 'image',
+        name: 'Parts',
+        src: toDataUrl(sampleSvg),
+        width: 40,
+        height: 40,
+      })
+      s.addLayer(asset.id)
+      const handle = mountComponent(Timeline, {})
+      await nextTick()
+      // Layer tracks render as `.track` without a kind-specific suffix;
+      // the first track-name in the host is the layer we just added.
+      const name = handle.host.querySelector('.track .track-name') as HTMLElement | null
+      expect(name).toBeTruthy()
+      name!.dispatchEvent(
+        new MouseEvent('contextmenu', {
+          bubbles: true,
+          cancelable: true,
+          clientX: 20,
+          clientY: 20,
+        }),
+      )
+      await nextTick()
+      const menus = Array.from(handle.host.querySelectorAll('.kf-menu')) as HTMLElement[]
+      const menu = menus[menus.length - 1]
+      expect(menu).toBeTruthy()
+      const items = Array.from(menu.querySelectorAll('.kf-menu-item')) as HTMLButtonElement[]
+      const hasSplit = items.some((b) => b.textContent?.includes(i18nT('timeline.splitSvg')))
+      expect(hasSplit).toBe(true)
+      handle.unmount()
+    })
+
+    test('Split SVG entry is absent for a raster (PNG) layer', async () => {
+      const s = makeFreshStore()
+      const asset = s.addAsset({
+        kind: 'image',
+        name: 'Raster',
+        src: 'data:image/png;base64,iVBORw0K==',
+        width: 40,
+        height: 40,
+      })
+      s.addLayer(asset.id)
+      const handle = mountComponent(Timeline, {})
+      await nextTick()
+      // Layer tracks render as `.track` without a kind-specific suffix;
+      // the first track-name in the host is the layer we just added.
+      const name = handle.host.querySelector('.track .track-name') as HTMLElement | null
+      expect(name).toBeTruthy()
+      name!.dispatchEvent(
+        new MouseEvent('contextmenu', {
+          bubbles: true,
+          cancelable: true,
+          clientX: 20,
+          clientY: 20,
+        }),
+      )
+      await nextTick()
+      const menus = Array.from(handle.host.querySelectorAll('.kf-menu')) as HTMLElement[]
+      const menu = menus[menus.length - 1]
+      const items = Array.from(menu.querySelectorAll('.kf-menu-item')) as HTMLButtonElement[]
+      const hasSplit = items.some((b) => b.textContent?.includes(i18nT('timeline.splitSvg')))
+      expect(hasSplit).toBe(false)
+      handle.unmount()
+    })
+  })
+
   suite('ui — Timeline audio track', () => {
     test('audio track renders as an .audio-track lane with one block per clip', async () => {
       const s = makeFreshStore()
diff --git a/src/i18n/messages.ts b/src/i18n/messages.ts
index 8b37207..9562165 100644
--- a/src/i18n/messages.ts
+++ b/src/i18n/messages.ts
@@ -294,6 +294,7 @@ export const en = {
     separate: 'Separate Position and Rotation',
     rotation: 'Rotation',
     position: 'Position',
+    splitSvg: 'Split SVG into paths',
     removeInstanceDialog: {
       title: 'Remove clip instance?',
       message: 'Remove "{name}" at {time}s from the timeline.',
diff --git a/src/lib/svgSplit.ts b/src/lib/svgSplit.ts
new file mode 100644
index 0000000..3e6b177
--- /dev/null
+++ b/src/lib/svgSplit.ts
@@ -0,0 +1,150 @@
+/**
+ * Split an SVG document into its top-level drawable children. Each
+ * returned part carries its own standalone SVG (viewBox shrunk to the
+ * part's bounding box) + a pre-computed data URL suitable for use as
+ * an image asset. Intended for the timeline's "Split SVG" action,
+ * which replaces a single SVG-backed layer with one layer per part.
+ *
+ * Top-level = a direct child of the root <svg>. We do not recurse into
+ * <g>s; a whole group stays intact as one part. `<defs>`, `<style>`,
+ * metadata and plain text nodes are skipped (they don't render
+ * independently).
+ */
+
+const SVG_NS = 'http://www.w3.org/2000/svg'
+
+export interface SvgPart {
+  /** Suggested layer/asset name. Derived from `id`/`aria-label` if the
+   *  element carries one, else the tag name with a 1-based index. */
+  name: string
+  /** Standalone SVG text. Same size + viewBox as the ORIGINAL SVG —
+   *  only the body differs (a single drawable per part). That way the
+   *  store can keep the new layer's position/scale identical to the
+   *  original and each part renders exactly where it used to, without
+   *  any geometry math that could go wrong on complex SVGs. */
+  svgText: string
+  /** Ready-to-use `data:image/svg+xml;...` URL for the new image asset. */
+  dataUrl: string
+}
+
+export interface SvgSplitResult {
+  parts: SvgPart[]
+}
+
+/** Quote an attribute value for embedding in a built SVG string. */
+function escapeAttr(value: string): string {
+  return value
+    .replace(/&/g, '&amp;')
+    .replace(/"/g, '&quot;')
+    .replace(/</g, '&lt;')
+    .replace(/>/g, '&gt;')
+}
+
+/** Serialise an SVG string into a percent-encoded data URL. `#` and
+ *  `?` MUST stay encoded — browsers treat them as fragment / query
+ *  separators in data URLs, and a single unencoded `#` (common in
+ *  fill="#rrggbb" attributes) truncates the SVG at its first colour
+ *  value. A few safe characters get decoded for compactness. */
+function toDataUrl(svgText: string): string {
+  const encoded = encodeURIComponent(svgText).replace(
+    /%(20|22|3D)/g,
+    (_, c) => ({ '20': ' ', '22': '"', '3D': '=' })[c as '20' | '22' | '3D'] ?? _,
+  )
+  return `data:image/svg+xml,${encoded}`
+}
+
+/** Element tags whose bbox we skip when looking for splittable
+ *  children. Everything else goes through getBBox. */
+const NON_DRAWABLE = new Set([
+  'defs',
+  'style',
+  'metadata',
+  'title',
+  'desc',
+  'clipPath',
+  'mask',
+  'filter',
+  'symbol',
+  'marker',
+  'script',
+])
+
+export function splitSvg(svgText: string): SvgSplitResult | null {
+  const doc = new DOMParser().parseFromString(svgText, 'image/svg+xml')
+  if (doc.getElementsByTagName('parsererror').length > 0) return null
+  const root = doc.documentElement
+  if (!root || root.localName !== 'svg') return null
+
+  // Collect drawable top-level children in document order.
+  const drawables: Element[] = []
+  for (const child of Array.from(root.children)) {
+    if (NON_DRAWABLE.has(child.localName)) continue
+    drawables.push(child)
+  }
+  if (drawables.length < 2) return null
+
+  // Root presentation attributes to carry forward to each part's new
+  // <svg> root so inherited fill/stroke/color/etc. behave the same
+  // way they did inside the original document.
+  const INHERITABLE_ATTRS = [
+    'fill',
+    'stroke',
+    'stroke-width',
+    'stroke-linecap',
+    'stroke-linejoin',
+    'stroke-miterlimit',
+    'stroke-dasharray',
+    'stroke-dashoffset',
+    'stroke-opacity',
+    'fill-opacity',
+    'fill-rule',
+    'color',
+    'opacity',
+    'font-family',
+    'font-size',
+    'font-weight',
+    'font-style',
+  ]
+
+  // Build a fresh attribute list for the new root: same width/height/
+  // viewBox as the original, plus any inherited presentation attrs the
+  // original had on its root.
+  const rootAttrParts: string[] = [`xmlns="${SVG_NS}"`]
+  const vb = root.getAttribute('viewBox')
+  if (vb) rootAttrParts.push(`viewBox="${escapeAttr(vb)}"`)
+  const rw = root.getAttribute('width')
+  if (rw) rootAttrParts.push(`width="${escapeAttr(rw)}"`)
+  const rh = root.getAttribute('height')
+  if (rh) rootAttrParts.push(`height="${escapeAttr(rh)}"`)
+  for (const a of INHERITABLE_ATTRS) {
+    const v = root.getAttribute(a)
+    if (v != null) rootAttrParts.push(`${a}="${escapeAttr(v)}"`)
+  }
+  const rootAttrs = rootAttrParts.join(' ')
+
+  // <defs>, <style> and other non-drawable children are preserved
+  // verbatim in every part so referenced ids (gradients, clipPaths,
+  // filters) still resolve standalone.
+  const serializer = new XMLSerializer()
+  const defsXml = Array.from(root.children)
+    .filter((c) => NON_DRAWABLE.has(c.localName))
+    .map((d) => serializer.serializeToString(d))
+    .join('')
+
+  const parts: SvgPart[] = []
+  for (let i = 0; i < drawables.length; i++) {
+    const el = drawables[i]
+    // Keep the full original canvas — only the BODY differs. Each
+    // part is a same-sized SVG with one drawable at its original
+    // coordinates, so the store can reuse the source layer's
+    // position/scale without any geometry math.
+    const childXml = serializer.serializeToString(el)
+    const svgText = `<svg ${rootAttrs}>${defsXml}${childXml}</svg>`
+    const name =
+      el.getAttribute('id') ||
+      el.getAttribute('aria-label') ||
+      `${el.localName} ${i + 1}`
+    parts.push({ name, svgText, dataUrl: toDataUrl(svgText) })
+  }
+  return { parts }
+}
diff --git a/src/stores/scene.ts b/src/stores/scene.ts
index ef57065..30c4d76 100644
--- a/src/stores/scene.ts
+++ b/src/stores/scene.ts
@@ -28,6 +28,7 @@ import type {
 } from '@/types/scene'
 import { BUTTON_STATE_TIMES, DEFAULT_BASE_PROPS } from '@/types/scene'
 import { sampleLayer } from '@/lib/interpolate'
+import { splitSvg as splitSvgRuntime } from '@/lib/svgSplit'
 import {
   buildMarkerMap,
   evalAction,
@@ -40,6 +41,40 @@ const uid = () => Math.random().toString(36).slice(2, 10)
 
 type AssetInit = Asset extends infer A ? (A extends Asset ? Omit<A, 'id'> : never) : never
 
+/** A source URL is considered SVG if it's a `data:image/svg+xml` payload.
+ *  External URLs are rare in this app (imports data-URL everything) and
+ *  splitting them would need a network fetch we don't want to run
+ *  synchronously inside an action. */
+function isSvgSource(src: string | undefined): boolean {
+  if (!src) return false
+  return src.startsWith('data:image/svg+xml')
+}
+
+/** Pull the SVG text out of a data URL. Supports both the URL-encoded
+ *  (`data:image/svg+xml,`...) and base64 (`data:image/svg+xml;base64,`...)
+ *  forms produced by the importer. Returns null when the payload is
+ *  malformed so callers can silently bail out. */
+function decodeSvgDataUrl(src: string): string | null {
+  const comma = src.indexOf(',')
+  if (comma < 0) return null
+  const header = src.slice(0, comma)
+  const payload = src.slice(comma + 1)
+  try {
+    if (header.includes(';base64')) {
+      // atob produces a binary string; re-decode as UTF-8 so high-
+      // byte chars (non-ASCII attribute values, embedded CSS, etc.)
+      // come through intact instead of mojibake.
+      const binary = atob(payload)
+      const bytes = new Uint8Array(binary.length)
+      for (let i = 0; i < binary.length; i++) bytes[i] = binary.charCodeAt(i)
+      return new TextDecoder('utf-8').decode(bytes)
+    }
+    return decodeURIComponent(payload)
+  } catch {
+    return null
+  }
+}
+
 const KEYFRAME_EPSILON = 1e-3
 
 /** Shared cascading push-aside helper used by the audio-clip and clip-
@@ -704,6 +739,123 @@ export const useSceneStore = defineStore('scene', {
         this.selectedLayerIds = this.selectedLayerIds.filter((x) => x !== id)
       }
     },
+
+    /** Replace a single SVG-backed layer with one layer per top-level
+     *  drawable in the SVG. Each new layer lands in the stack slot of
+     *  the original and preserves every animatable field — base,
+     *  keyframes, scale, rotation, opacity. Positions are recomputed
+     *  so the parts stay visually pinned to their pre-split spots on
+     *  the stage. Returns the new layer ids, or `null` if the layer
+     *  isn't SVG-backed or the SVG has fewer than 2 splittable parts. */
+    splitLayerSvg(layerId: string): string[] | null {
+      const layer = this.activeLayers.find((l) => l.id === layerId)
+      if (!layer) return null
+      const asset = this.scene.assets.find((a) => a.id === layer.assetId)
+      if (!asset || asset.kind !== 'image') return null
+      if (!isSvgSource(asset.src)) return null
+      const svgText = decodeSvgDataUrl(asset.src)
+      if (!svgText) return null
+      const split = splitSvgRuntime(svgText)
+      if (!split || split.parts.length < 2) return null
+      const parts = split.parts
+
+      // Insert location: wherever the original sat inside trackOrder
+      // or inside its parent group's childIds.
+      const order = this.scene.trackOrder ?? []
+      const topIdx = order.indexOf(layerId)
+      let parentGroup: TrackGroup | null = null
+      let childIdx = -1
+      if (topIdx < 0) {
+        for (const g of this.scene.groups ?? []) {
+          const i = g.childIds.indexOf(layerId)
+          if (i >= 0) {
+            parentGroup = g
+            childIdx = i
+            break
+          }
+        }
+      }
+
+      const newLayerIds: string[] = []
+      const newAssets: Asset[] = []
+      const newLayers: Layer[] = []
+
+      // Each part is a full-sized copy of the original SVG with only
+      // one drawable in its body. That means every new layer inherits
+      // the original's position/scale/keyframes verbatim — the part
+      // renders exactly where it was because its SVG canvas is the
+      // same size and coordinate space as before.
+      const cloneKeyframes = (kfs: Keyframe[] | undefined): Keyframe[] | undefined => {
+        if (!kfs) return kfs
+        return kfs.map((kf) => ({
+          ...kf,
+          id: uid(),
+          props: { ...kf.props },
+        }))
+      }
+
+      for (const part of parts) {
+        const partAsset: Asset = {
+          id: uid(),
+          kind: 'image',
+          name: `${asset.name} · ${part.name}`,
+          src: part.dataUrl,
+          width: asset.width,
+          height: asset.height,
+        }
+        newAssets.push(partAsset)
+
+        const partLayer: Layer = {
+          id: uid(),
+          name: `${layer.name} · ${part.name}`,
+          assetId: partAsset.id,
+          visible: layer.visible,
+          base: { ...layer.base },
+          keyframes: cloneKeyframes(layer.keyframes) ?? [],
+          offsetX: layer.offsetX ?? asset.width / 2,
+          offsetY: layer.offsetY ?? asset.height / 2,
+        }
+        if (layer.positionKeyframes) {
+          partLayer.positionKeyframes = cloneKeyframes(layer.positionKeyframes)
+        }
+        if (layer.rotationKeyframes) {
+          partLayer.rotationKeyframes = cloneKeyframes(layer.rotationKeyframes)
+        }
+        if (layer.separated) partLayer.separated = true
+        if (layer.color !== undefined) partLayer.color = layer.color
+        if (layer.colorOverridden !== undefined) partLayer.colorOverridden = layer.colorOverridden
+        if (layer.locked) partLayer.locked = layer.locked
+        if (layer.editorHidden) partLayer.editorHidden = layer.editorHidden
+        newLayers.push(partLayer)
+        newLayerIds.push(partLayer.id)
+      }
+
+      // Commit: push new assets, insert new layers at the original
+      // slot, then remove the original.
+      this.scene.assets.push(...newAssets)
+      const layers = this.activeLayers
+      const origIdx = layers.findIndex((l) => l.id === layerId)
+      if (origIdx >= 0) layers.splice(origIdx, 1, ...newLayers)
+      else layers.push(...newLayers)
+
+      if (parentGroup && childIdx >= 0) {
+        parentGroup.childIds.splice(
+          childIdx,
+          1,
+          ...newLayers.map((l) => l.id),
+        )
+      } else if (topIdx >= 0) {
+        this.scene.trackOrder!.splice(topIdx, 1, ...newLayers.map((l) => l.id))
+      } else {
+        ;(this.scene.trackOrder ||= []).unshift(...newLayers.map((l) => l.id))
+      }
+
+      if (this.selectedLayerId === layerId) {
+        this.selectedLayerId = newLayerIds[0] ?? null
+        this.selectedLayerIds = newLayerIds
+      }
+      return newLayerIds
+    },
     moveLayer(fromIndex: number, toIndex: number) {
       const arr = this.activeLayers
       if (fromIndex < 0 || fromIndex >= arr.length) return
diff --git a/src/version.ts b/src/version.ts
index 2d51acd..61781a5 100644
--- a/src/version.ts
+++ b/src/version.ts
@@ -1,2 +1,2 @@
-export const APP_VERSION = '0.16.1'
+export const APP_VERSION = '0.17.0'
 export const APP_NAME = 'RUWIO'