fix: keep an outside draft written to an editor still loading behind a move

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015vn1jCHUcAdaG9C4NsUehF

frontend/src/lib/itemStore.svelte.ts

@@ -421,8 +421,14 @@ class Entry<V> {
 	 *  changed from its own deployed side, so they stay a draft over what this entry deployed.
 	 *  Compared exactly, as a save is: a field the draft comparison ignores (run-as) is an edit. */
 	carryEditsOf(old: Entry<V>): void {
-		if (old.origin !== 'deployed' || old.value === undefined || old.deployed === undefined) return
-		if (this.value === undefined) return
+		if (old.value === undefined || this.value === undefined) return
+		// Not loaded yet (its read waits behind the move): only an outside write can have filled it,
+		// and nothing has persisted that write but this entry.
+		if (!old.loaded) {
+			this.applyExternal(old.value)
+			return
+		}
+		if (old.origin !== 'deployed' || old.deployed === undefined) return
 		const edited = old.value as Record<string, unknown>
 		const base = old.deployed as Record<string, unknown>
 		const next = snapshot(this.value) as Record<string, unknown>

frontend/src/lib/itemStore.test.ts

@@ -556,6 +556,36 @@ describe('item store: one entry per key', () => {
 		expect(rows.writes.at(-1)).toEqual({ path: 'u/me/b', value: chat })
 	})
 
+	it('keeps a draft written from outside to an editor that opened during the move', async () => {
+		const rows = fakeRows()
+		const store = createItemStore(rows.port)
+		const gate = deferred()
+		const b = { ...deployedRes, path: 'u/me/b' }
+		const temporary = newItemPath()
+		const { handle: moving } = store.acquire(
+			{ workspace: 'w', kind: 'resource', path: temporary },
+			{ workspace: 'w', path: temporary, template: b },
+			adapter({}, () => gate.promise)
+		)
+		await settle()
+		moving.value = { ...b, args: { a: 2 } }
+		const moved = moving.save()
+		await settle()
+		const { handle: opened } = store.acquire(
+			{ workspace: 'w', kind: 'resource', path: 'u/me/b' },
+			{ workspace: 'w', path: 'u/me/b' },
+			adapter({ deployed: b })
+		)
+		const chat = { ...b, description: 'written by the chat meanwhile' }
+		// The opened editor holds the key, so the store persists it.
+		expect(store.bridge.seed('w', 'resource', 'u/me/b', chat)).toBe(true)
+
+		gate.resolve()
+		expect(await moved).toMatchObject({ ok: true, moved: true })
+		expect(opened.value).toEqual(chat)
+		expect(rows.writes.at(-1)).toEqual({ path: 'u/me/b', value: chat })
+	})
+
 	it('keeps a change the draft comparison ignores in an editor a move replaces', async () => {
 		type Sched = { path: string; summary: string; permissioned_as?: string }
 		const rows = fakeRows()