add-patch: add NEEDSWORK about comparing commits

The two versions of add-patch has special-casing for the literal
revision "HEAD". However, we want to handle other ways of saying "HEAD"
in the same way.[0] Add a NEEDSWORK to the add-patch code that does this
so that it can be addressed later.

[0]: https://lore.kernel.org/git/xmqqsgat7ttf.fsf@gitster.c.googlers.com/

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

add-patch.c

@@ -1646,6 +1646,14 @@ int run_add_p(struct repository *r, enum add_p_mode mode,
 	if (mode == ADD_P_STASH)
 		s.mode = &patch_mode_stash;
 	else if (mode == ADD_P_RESET) {
+		/*
+		 * NEEDSWORK: Instead of comparing to the literal "HEAD",
+		 * compare the commit objects instead so that other ways of
+		 * saying the same thing (such as "@") are also handled
+		 * appropriately.
+		 *
+		 * This applies to the cases below too.
+		 */
 		if (!revision || !strcmp(revision, "HEAD"))
 			s.mode = &patch_mode_reset_head;
 		else

git-add--interactive.perl

@@ -1807,6 +1807,13 @@ sub process_args {
 				$arg = shift @ARGV or die __("missing --");
 				if ($arg ne '--') {
 					$patch_mode_revision = $arg;
+
+					# NEEDSWORK: Instead of comparing to the literal "HEAD",
+					# compare the commit objects instead so that other ways of
+					# saying the same thing (such as "@") are also handled
+					# appropriately.
+					#
+					# This applies to the cases below too.
 					$patch_mode = ($arg eq 'HEAD' ?
 						       'reset_head' : 'reset_nothead');
 					$arg = shift @ARGV or die __("missing --");