DDP events may only be consumed after AppState change on iOS

[bratelefant]

Describe the bug
It may happen, that after a method call, the resulting update and result DDP messages are being received, but the corresponding ddp events are not being processed in the client event queue.

To Reproduce
I'm afraid I have no working example project to reproduce this yet; also in my production app, this occurs in only a few components. First occurence was after migration to react navigation v7 from v6. It is a component simply fetching data from meteor 3.2.0 server via a single method call.

Expected behavior
All incoming messages trigger an event instantly.

Screenshots
n/A

Possible solution
I changed a few lines in lib/ddp.js in order to change the way the emit method defers calling the EventEmitter.emit method by defering it to a microtask rather than a macrotask, so that the event will be emitted before the next frame renders.

before

emit() {
    setTimeout(super.emit.bind(this, ...arguments), 0);
  }

after

emit(...args) {
    Promise.resolve().then(() => super.emit(...args));
    return true;
  }

[jankapunkt]

I think you can safely create a PR for this one and I'm preparing a new patch release with some dependency updates as well

[jankapunkt]

published in 2.9.0 please close if this is fixed with this release