Should we guarantee no events when the application loop is not running

[derekdreery]

I'm currently on x11 running the gpu example and getting a size event upon window creation, before app.run(). Should this event be deferred until then?

[raphlinus]

This is all pretty deep water, and I'm inclined not to make any deep changes right now, but rather basically follow what Druid does re event loop and window lifecycles, ie make changes in xilem to accommodate the nondeterminism in events. Currently in xilem, running the app render is too closely tied to paint.

Getting a size (and scale for that matter) really early in window creation makes a lot of sense. In fact, we probably should document it as an invariant that you get one before the first paint cycle.