Prevent deletion of page_on_front

[jameskoster]

If you set a static homepage, then delete that page, the site will revert to displaying latest posts. This can be a bit unexpected, especially if the site doesn't utilise a blog. It could improve the overall UX to place a guardrail here, preventing users from deleting the homepage.

An API for protecting pages could be useful. For instance WooCommerce may want to prohibit the deletion of shop, cart, and checkout pages.

[fcoveram]

I shared an idea in #68134 that includes this use case. The design shows the "Move to trash" item but in a disabled state with a help text saying that a homepage needs to be set first.

There is also a second version. I'm curious whether the main proposal meets accessibility requirements.