[PATCH v4 1/2] commit-graph: fix bogus counter in "Scanning merged commits" progress line

From: SZEDER Gábor <redacted>

The final value of the counter of the "Scanning merged commits"
progress line is always one less than its expected total, e.g.:

  Scanning merged commits:  83% (5/6), done.

This happens because while iterating over an array the loop variable
is passed to display_progress() as-is, but while C arrays (and thus
the loop variable) start at 0 and end at N-1, the progress counter
must end at N. Fix this by passing 'i + 1' to display_progress(), like
most other callsites do.

There's an RFC series to add a GIT_TEST_CHECK_PROGRESS=1 mode[1] which
catches this issue in the 'fetch.writeCommitGraph' and
'fetch.writeCommitGraph with submodules' tests in
't5510-fetch.sh'. The GIT_TEST_CHECK_PROGRESS=1 mode is not part of
this series, but future changes to progress.c may add it or similar
assertions to catch this and similar bugs elsewhere.

1. https://lore.kernel.org/git/20210620200303.2328957-1-szeder.dev@gmail.com/ (local)

Signed-off-by: SZEDER Gábor <redacted>
Signed-off-by: Ævar Arnfjörð Bjarmason <redacted>
---
 commit-graph.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/commit-graph.c b/commit-graph.c
index 00614acd65d..46170592204 100644
--- a/commit-graph.c
+++ b/commit-graph.c

@@ -2125,7 +2125,7 @@ static void sort_and_scan_merged_commits(struct write_commit_graph_context *ctx)
 
 	ctx->num_extra_edges = 0;
 	for (i = 0; i < ctx->commits.nr; i++) {
-		display_progress(ctx->progress, i);
+		display_progress(ctx->progress, i + 1);
 
 		if (i && oideq(&ctx->commits.list[i - 1]->object.oid,
 			  &ctx->commits.list[i]->object.oid)) {

-- 
2.33.0.825.gdc3f7a2a6c7