This is how it’s currently handled:
If the edit itself is not a regular edit [Moved, deleted, protected] that edit item will NOT be clickable. However, If it is a regular edit but the page is deleted, it will be clickable but will result in an error feedback shown to the user
This needs to be adressed in a better way. Design needs to look at proper UI copy to educate people and possibly support it with an illustration (similar to a 404 page on the Web)
The technical question to answer is: how do we detect if the page has been moved from only a specific watchlist entry (diff) that happened prior to the page having been moved?
Also, what kind of UX should we provide for the user to remove a page from their watchlist that has been moved?