Defer OnAfterTreeRender until end of tick to ensure children processed first and references set (#1180) * Defer OnAfterTreeRender until end of tick to ensure children processed first and references set * Only update (run pending events, tick, scroll velocity) after render once - reset that flag on hotload if render tree becomes dirty * Revert "Only update (run pending events, tick, scroll velocity) after render once - reset that flag on hotload if render tree becomes dirty" This reverts commit aae36e1777d11a5649c24985c0f8802ced3397b4.