Re: [PATCH 2/8] built-in add -i: prepare for multi-selection commands

> From: Johannes Schindelin <johannes.schindelin@gmx.de>
>
> The `upgrade`, `revert` and `add-untracked` commands allow selecting
> multiple entries. Let's extend the `list_and_choose()` function to
> accommodate those use cases.

>
> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
> ---
>  add-interactive.c | 114 ++++++++++++++++++++++++++++++++++++----------
>  1 file changed, 89 insertions(+), 25 deletions(-)
>
> diff --git a/add-interactive.c b/add-interactive.c
> index 8ec930ac15..33a751150a 100644
> --- a/add-interactive.c
> +++ b/add-interactive.c
> @@ -72,15 +72,17 @@ static void init_add_i_state(struct add_i_state *s, struct repository *r)
>  struct prefix_item_list {
>  	struct string_list items;
>  	struct string_list sorted;
> +	int *selected; /* for multi-selections */
>  	size_t min_length, max_length;
>  };