- Update to version 0.40.0:
  - Added `zero` event that is triggered when there's no match
    ```sh
    # Reload the candidate list when there's no match
    echo $RANDOM | fzf --bind 'zero:reload(echo $RANDOM)+clear-query' --height 3
    ```
  - New actions
      - Added `track` action which makes fzf track the current item when the
        search result is updated. If the user manually moves the cursor, or the
        item is not in the updated search result, tracking is automatically
        disabled. Tracking is useful when you want to see the surrounding items
        by deleting the query string.
        ```sh
        # Narrow down the list with a query, point to a command,
        # and hit CTRL-T to see its surrounding commands.
        export FZF_CTRL_R_OPTS="
          --preview 'echo {}' --preview-window up:3:hidden:wrap
          --bind 'ctrl-/:toggle-preview'
          --bind 'ctrl-t:track+clear-query'
          --bind 'ctrl-y:execute-silent(echo -n {2..} | pbcopy)+abort'
          --color header:italic
          --header 'Press CTRL-Y to copy command into clipboard'"
        ```
      - Added `change-header(...)`
      - Added `transform-header(...)`
      - Added `toggle-track` action
  - Fixed `--track` behavior when used with `--tac`
      - However, using `--track` with `--tac` is not recommended. The resulting
        behavior can be very confusing.
  - Bug fixes and improvements

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