[Webkit-unassigned] [Bug 216769] New: Indexed DB transactions outdated immediately after it just created

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=216769

            Bug ID: 216769
           Summary: Indexed DB transactions outdated immediately after it
                    just created
           Product: WebKit
           Version: Safari 13
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: zjwpeter at gmail.com

Reproduction:

Note: idb is a famous library that wrap IndexedDB API into Promise style to make it easier to use.

It does not contains high level abstractions so it is likely not the bug of idb itself.

For reference, this issue is also tracked in the https://github.com/jakearchibald/idb/issues/201

Expected result on Chrome and Firefox:
https://user-images.githubusercontent.com/5390719/93753730-358a2900-fc33-11ea-80a5-b7d4f3eb731e.png

Bad result on Safari:
https://user-images.githubusercontent.com/5390719/93753660-12f81000-fc33-11ea-94c5-7771dab160c2.png

```js
import('https://cdn.skypack.dev/idb@5.0.6/with-async-ittr').then(async (idb) => {
    await idb.deleteDB('test')
    const sleep = (ms) => new Promise((resolve) => setTimeout(resolve, ms))
    const openDB = (() => {
        /** @type {import('idb').IDBPDatabase<unknown>} */
        let db = undefined
        return async () => {
            if (db) return db
            if (!db)
                db = await idb.openDB('test', 1, {
                    upgrade(db, oldVersion, newVersion, transaction) {
                        db.createObjectStore('store')
                    },
                })
            db.addEventListener('close', () => (db = undefined))
            return db
        }
    })()
    /** @type {import('idb').IDBPTransaction<unknown, ["store"]>} */
    let transaction = undefined
    const beforeTx = async () => {
        try {
            await transaction.objectStore('store').openCursor(IDBKeyRange.only('a'))
            console.log('The transaction is alive!')
        } catch (e) {
            console.log('Transaction outdated', e, 'creating new one')
            transaction = (await openDB()).transaction('store', 'readwrite')
        }
    }
    await beforeTx()
    await transaction.store.add({ a: 1 }, 'a')
    console.log('added a')
    await beforeTx()
    await transaction.store.add({ a: 1 }, 'b')
    console.log('added b')

    await sleep(120)
    await beforeTx()
    await transaction.store.add({ a: 1 }, 'c')
    console.log('added c')

    await sleep(120)
    console.log('before call beforeTx')
    await beforeTx()
    console.log('after call beforeTx')
    const cursor = await transaction.store.openCursor(IDBKeyRange.only('a'))
    console.log(cursor.value)
    const next = await cursor.continue()
    console.log(next)
})
```

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