add: update --renormalize to skip sparse paths

We added checks for path_in_sparse_checkout() to portions of 'git add'
that add warnings and prevent stagins a modification, but we skipped the
--renormalize mode. Update renormalize_tracked_files() to ignore cache
entries whose path is outside of the sparse-checkout cone (unless
--sparse is provided). Add a test in t3705.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/add.c

@@ -154,7 +154,9 @@ static int renormalize_tracked_files(const struct pathspec *pathspec, int flags)
 	for (i = 0; i < active_nr; i++) {
 		struct cache_entry *ce = active_cache[i];
 
-		if (ce_skip_worktree(ce))
+		if (!include_sparse &&
+		    (ce_skip_worktree(ce) ||
+		     !path_in_sparse_checkout(ce->name, &the_index)))
 			continue;
 		if (ce_stage(ce))
 			continue; /* do not touch unmerged paths */

t/t3705-add-sparse-checkout.sh

@@ -172,6 +172,9 @@ test_expect_success 'git add fails outside of sparse-checkout definition' '
 	test_must_fail git add --chmod=+x sparse_entry &&
 	test_sparse_entry_unstaged &&
 
+	test_must_fail git add --renormalize sparse_entry &&
+	test_sparse_entry_unstaged &&
+
 	# Avoid munging CRLFs to avoid an error message
 	git -c core.autocrlf=input add --sparse sparse_entry 2>stderr &&
 	test_must_be_empty stderr &&
@@ -181,7 +184,14 @@ test_expect_success 'git add fails outside of sparse-checkout definition' '
 	git add --sparse --chmod=+x sparse_entry 2>stderr &&
 	test_must_be_empty stderr &&
 	test-tool read-cache --table >actual &&
-	grep "^100755 blob.*sparse_entry\$" actual
+	grep "^100755 blob.*sparse_entry\$" actual &&
+
+	git reset &&
+
+	# This will print a message over stderr on Windows.
+	git add --sparse --renormalize sparse_entry &&
+	git status --porcelain >actual &&
+	grep "^M  sparse_entry\$" actual
 '
 
 test_expect_success 'add obeys advice.updateSparsePath' '