We get a lot of duplicate wishes. The way we typically deal with them is to redirect the duplicate to the original, along with copying/pasting any relevant content.

Instead I think we should do it like Phabricator, where the old wish remains fully intact (not a redirect), but we just hide it from the list of wishes.

Acceptance criteria

• Add a "Reason" dropdown when declining a wish that allows user to select "Duplicate"
• When "Duplicate" is selected as the "Declined" reason , users will see a text field where they can enter the duplicate wish ID (ex. W123)
  • Wish selection can just be an input for the wish ID, until we have a better search in place

• After submission, change to the "declined" status.
• Insert template community wishlist decline wikitext in the wish's description (ex: {{Community Wishlist/Decline|duplicate|W456}} )
• If the proposer of the duplicate wish has a vote, it should be transferred to the other wish
• This doesn't include a way to merge descriptions of both wishes