[proposal] Investigate requestIdleCallback for offscreen tabs

[eonarheim]

Context

Currently browsers do not run requestAnimationFrame when browser are minimized/not visible, this is intentional to preserve device battery and prevent abuse.

However it is advantageous to some games to still run some logic (especially multiplayer) during this offscreen state.

Proposal

Investigate a possible mode with requestIdleCallback where game logic can still run while offscreen. It might be possible to modify the excalibur Clock to optionally switch to this other method, it won't be called at the screen refresh rate, but it might be sufficient for offscreen game code.

We should build a proof of concept to see if this is viable.

[github-actions]

This issue hasn't had any recent activity lately and is being marked as stale automatically.

[mattjennings]

maybe this could be exposed as a separate lifecycle method? onIdleUpdate()?