IDB InvalidStateError due to timing issues with lazy-updates in database

[nolanlawson]

It's possible to get IDB (or at least fake-indexeddb) to throw this error:

InvalidStateError: An operation was called on an object on which it is not allowed
or at a time when it is not allowed. Also occurs if a request is made on a source
object that has been deleted or removed. Use TransactionInactiveError or
ReadOnlyError when possible, as they are more specific variations of InvalidStateError.

I have a repro forthcoming; it's in the unit tests.

[nolanlawson]

Repro: comment out this line:

emoji-picker-element/test/spec/database/Database.test.js

Line 156 in 2a57ba1

await db2._lazyUpdate // TODO [#407] Skipping this causes an InvalidStateError in IDB