i-t-a entries are excluded from tree building. Relying solely on active_nr
(or diff without --shift-ita) may lead to empty commits sometimes, when
i-t-a entries are the only ones "changed" in the index.

Signed-off-by: Nguyễn Thái Ngọc Duy <[email protected]>
---
 builtin/commit.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/builtin/commit.c b/builtin/commit.c
index fcfaa2b..e98ca8a 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -894,9 +894,14 @@ static int prepare_to_commit(const char *index_file, const 
char *prefix,
                if (amend)
                        parent = "HEAD^1";
 
-               if (get_sha1(parent, sha1))
-                       commitable = !!active_nr;
-               else {
+               if (get_sha1(parent, sha1)) {
+                       int i, ita_nr = 0;
+
+                       for (i = 0; i < active_nr; i++)
+                               if (ce_intent_to_add(active_cache[i]))
+                                       ita_nr++;
+                       commitable = active_nr - ita_nr == 0;
+               } else {
                        /*
                         * Unless the user did explicitly request a submodule
                         * ignore mode by passing a command line option we do
@@ -910,6 +915,7 @@ static int prepare_to_commit(const char *index_file, const 
char *prefix,
                        if (ignore_submodule_arg &&
                            !strcmp(ignore_submodule_arg, "all"))
                                diff_flags |= DIFF_OPT_IGNORE_SUBMODULES;
+                       diff_flags |= DIFF_OPT_SHIFT_INTENT_TO_ADD;
                        commitable = index_differs_from(parent, diff_flags);
                }
        }
-- 
2.8.2.524.g6ff3d78

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