V1.7.19 and Calendar widget: what does it mean?

Hi there,

Latest release introduces this:

Widgets

  • The calendar is now a widget type of its own rather than a custom widget bundled with Grist, and existing calendar pages move to it automatically. […] GRIST_SKIP_BUNDLED_WIDGETS no longer does anything (#2457)
  1. What does it mean it concrete terms?
  2. For self-hosted instances, if we use customized forks of the grist-widgets repository (for e.g in my case I implement this), what is the situation?

Thanks!