Background

Before, you could only place a single block on a user at a time. So the only information you need to remove a block is the username, i.e. Special:Unblock/Username.

With multiblocks, we need a means to remove a specific block on a user. This is necessary for no-JS users, and for any "unblock" links that may appear elsewhere on the wiki (such as Special:BlockList or at the top of Special:Contribs/SomeBlockedUser).

We've decided we do not want to update the form to use Codex.

Acceptance criteria

SpecialUnblock.php:

• If neither the user/IP nor an id is specified
  • no change from current functionality
• When the user is specified
  • hide the "IP address, username or block ID" input and show the username/IP instead
  • show the "reason" input
  • show the "Watch this user's user and talk pages" checkbox
  • Show a button saying "remove all blocks for this user"
    • clicking the button will remove all blocks (after asking for confirmation)
  • Show a full list of active blocks for the user
  • Show the block log and the suppression log underneath
• When id is supplied
  • hide the "IP address, username or block ID" input and show the username/IP instead
  • show the "reason" input
  • show the "Watch this user's user and talk pages" checkbox
  • Show a button saying "remove block"
    • clicking the button will remove the specified block (after asking for confirmation)
  • show only the block that's about to be removed