Originally, "git mv" a sparse file from out-of-cone to
in-cone does not update the moved file's sparsity (remove its
SKIP_WORKTREE bit). And the corresponding cache entry is, unexpectedly,
not checked out in the working tree.

Update the behavior so that:
1. Moving from out-of-cone to in-cone removes the SKIP_WORKTREE bit from
   corresponding cache entry.
2. The moved cache entry is checked out in the working tree to reflect
   the updated sparsity.

Signed-off-by: Shaoxuan Yuan <redacted>
---
 builtin/mv.c                  | 18 ++++++++++++++++++
 t/t7002-mv-sparse-checkout.sh |  4 +---
 2 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/builtin/mv.c b/builtin/mv.c
index cb3441c7cb..a8b9f55654 100644
--- a/builtin/mv.c
+++ b/builtin/mv.c

@@ -13,6 +13,7 @@
 #include "string-list.h"
 #include "parse-options.h"
 #include "submodule.h"
+#include "entry.h"
 
 static const char * const builtin_mv_usage[] = {
 	N_("git mv [<options>] <source>... <destination>"),

@@ -399,6 +400,11 @@ int cmd_mv(int argc, const char **argv, const char *prefix)
 		const char *src = source[i], *dst = destination[i];
 		enum update_mode mode = modes[i];
 		int pos;
+		struct checkout state = CHECKOUT_INIT;
+		state.istate = &the_index;
+
+		if (force)
+			state.force = 1;
 		if (show_only || verbose)
 			printf(_("Renaming %s to %s\n"), src, dst);
 		if (show_only)

@@ -424,6 +430,18 @@ int cmd_mv(int argc, const char **argv, const char *prefix)
 		pos = cache_name_pos(src, strlen(src));
 		assert(pos >= 0);
 		rename_cache_entry_at(pos, dst);

+				int dst_pos;
+
+				dst_pos = cache_name_pos(dst, strlen(dst));
+				active_cache[dst_pos]->ce_flags &= ~CE_SKIP_WORKTREE;
+
+				if (checkout_entry(active_cache[dst_pos], &state, NULL, NULL))
+					die(_("cannot checkout %s"), ce->name);
+			}
+		}
 	}
 
 	if (gitmodules_modified)

diff --git a/t/t7002-mv-sparse-checkout.sh b/t/t7002-mv-sparse-checkout.sh
index 30e13b9979..7734119197 100755
--- a/t/t7002-mv-sparse-checkout.sh
+++ b/t/t7002-mv-sparse-checkout.sh

@@ -237,7 +237,6 @@ test_expect_success 'can move out-of-cone directory with --sparse' '
 	git mv --sparse folder1 sub 1>actual 2>stderr &&
 	test_must_be_empty stderr &&
 
-	git sparse-checkout reapply &&
 	test_path_is_dir sub/folder1 &&
 	test_path_is_file sub/folder1/file1
 '

@@ -260,7 +259,6 @@ test_expect_success 'can move out-of-cone file with --sparse' '
 	git mv --sparse folder1/file1 sub 1>actual 2>stderr &&
 	test_must_be_empty stderr &&
 
-	git sparse-checkout reapply &&
 	! test_path_is_dir sub/folder1 &&
 	test_path_is_file sub/file1
 '

@@ -278,7 +276,7 @@ test_expect_success 'refuse to move sparse file to existing destination' '
 	test_cmp expect stderr
 '
 
-test_expect_failure 'move sparse file to existing destination with --force and --sparse' '
+test_expect_success 'move sparse file to existing destination with --force and --sparse' '
 	test_when_finished "cleanup_sparse_checkout" &&
 	mkdir folder1 &&
 	touch folder1/file1 &&