use 'diff-tree' instead of 'diff'

modules/git/repo_compare.go

@@ -281,14 +281,15 @@ func (repo *Repository) GetPatch(base, head string, w io.Writer) error {
 
 // GetFilesChangedBetween returns a list of all files that have been changed between the given commits
 // If base is undefined empty SHA (zeros), it only returns the files changed in the head commit
+// If base is the SHA of an empty tree (EmptyTreeSHA), it returns the files changes from the initial commit to the head commit
 func (repo *Repository) GetFilesChangedBetween(base, head string) ([]string, error) {
-	var stdout string
-	var err error
+	cmd := NewCommand(repo.Ctx, "diff-tree", "--name-only", "--root", "--no-commit-id", "-r", "-z")
 	if base == EmptySHA {
-		stdout, _, err = NewCommand(repo.Ctx, "diff-tree", "--name-only", "--root", "--no-commit-id", "-r", "-z").AddDynamicArguments(head).RunStdString(&RunOpts{Dir: repo.Path})
+		cmd.AddDynamicArguments(head)
 	} else {
-		stdout, _, err = NewCommand(repo.Ctx, "diff", "--name-only", "-z").AddDynamicArguments(base + ".." + head).RunStdString(&RunOpts{Dir: repo.Path})
+		cmd.AddDynamicArguments(base + ".." + head)
 	}
+	stdout, _, err := cmd.RunStdString(&RunOpts{Dir: repo.Path})
 	if err != nil {
 		return nil, err
 	}

modules/git/repo_compare_test.go

@@ -140,6 +140,11 @@ func TestGetCommitFilesChanged(t *testing.T) {
 			"8d92fc957a4d7cfd98bc375f0b7bb189a0d6c9f2",
 			[]string{"file2.txt"},
 		},
+		{
+			"95bb4d39648ee7e325106df01a621c530863a653",
+			"8d92fc957a4d7cfd98bc375f0b7bb189a0d6c9f2",
+			[]string{"file2.txt"},
+		},
 		{
 			EmptyTreeSHA,
 			"8d92fc957a4d7cfd98bc375f0b7bb189a0d6c9f2",