Re: [PATCH v2] checkout.c: unstage empty deleted ita files

> It is possible to delete a committed file from the index and then add it
> as intent-to-add. After `git checkout HEAD`, the file should be
> identical in the index and HEAD. The command already works correctly if
> the file has contents in HEAD. This patch provides the desired behavior
> even when the file is empty in HEAD.
> 
> `git checkout HEAD` calls tree.c:read_tree_1(), with fn pointing to
> checkout.c:update_some(). update_some() creates a new cache entry but
> discards it when its mode and oid match those of the old entry. A cache
> entry for an ita file and a cache entry for an empty file have the same
> oid. Therefore, an empty deleted ita file previously passed both of
> these checks, and the new entry was discarded, so the file remained
> unchanged in the index. After this fix, if the file is marked as ita in
> the cache, then we avoid discarding the new entry and add the new entry
> to the cache instead.
> 
> This change should not affect newly added ita files. For those, inside
> tree.c:read_tree_1(), tree_entry_interesting() returns
> entry_not_interesting, so fn is never called.
> 
> Helped-by: Jeff King <peff@peff.net>
> Signed-off-by: Varun Naik <vcnaik94@gmail.com>
> ---
> This patch fixes and tests only "checkout", because "restore" has not
> reached maint yet. A second patch on the merge of this patch into master
> with a test case for "restore" is coming.