If a user creates a redirect with a "From" value that matches an existing redirect:
The new redirect doesn't work because the existing one takes preference
The post_name of the new redirect gets -2 appended, which means it will still not work even if the original is deleted because its hash won't match
The UI should show an error if you attempt to add or edit a redirect with a "From" value that matches and existing one, and suggest editing the original instead.
If a user creates a redirect with a "From" value that matches an existing redirect:
post_nameof the new redirect gets-2appended, which means it will still not work even if the original is deleted because its hash won't matchThe UI should show an error if you attempt to add or edit a redirect with a "From" value that matches and existing one, and suggest editing the original instead.