Run parent-update and transform-propagation during the "post-startup" stage (instead of "startup")

[jcornaz]

Hi,

Currently, parent_update_system and transform_propagate_system are registerd to run both at startup and for each update.

When running for ecah update they are in the stage POST_UPDATE. It makes sense, because it make sure they run after potential creation/update of Transform that would happen during the UPDATE stage.

But when running at startup, these two systems were in the default (STARTUP) stage. So if the user spawn entities during that stage (which is very likely, since it's the default), then the entities spawned by the user may have a incorrect GlobalTransform for the first update.

This discrepency looks very much like a small mistake. I assume that, If it is correct to run these two system during the POST_UPDATE of each update, then the correct things to do at startup is to run during the POST_STARTUP.

I hope it makes sense.

Thanks for this awseome work!

[cart]

Yup that all makes sense to me. Good catch!