Close#4430
Example:
# Implement popup that disappears after 1 second
# * Use footer as the popup
# * Use `bell` to ring the terminal bell
# * Use `bg-transform-footer` to clear the footer after 1 second
# * Use `bg-cancel` to ignore currently running background transform actions
fzf --multi --list-border \
--bind 'enter:execute-silent(echo -n {+} | pbcopy)+bell' \
--bind 'enter:+transform-footer(echo Copied {} to clipboard)' \
--bind 'enter:+bg-cancel+bg-transform-footer(sleep 1)'