[PATCH 2/2] read-cache: fix incorrect count and progress bar stalling

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

Fix a potential incorrect display of the number of items (off by one)
and stalling of the progress bar in refresh_index().

The off-by-one error is minor, we should say we're processing the 1st
item, not the 0th. This along with the next change also allows us to
remove the last display_progress() call outside the loop, as we'll
always have reached 100% now.

Let's also move the display_progress() call to the very start of the
loop refresh_index() loop. In the loop we first check whether e.g. we
ignore submodules and the entry we're processing is a submodule,
whether we ignore certain paths etc.. Thus we could have a
pathological case where we have a huge index consisting of such
ignored entries, and we'd stall on the progress bar.

See ae9af12287 (status: show progress bar if refreshing the index
takes too long, 2018-09-15) for the initial addition of this progress
bar to refresh_index().

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 read-cache.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/read-cache.c b/read-cache.c
index 470f800855..8b0073a839 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -1594,6 +1594,8 @@ int refresh_index(struct index_state *istate, unsigned int flags,
 		int t2_did_lstat = 0;
 		int t2_did_scan = 0;
 
+		display_progress(progress, i + 1);
+
 		ce = istate->cache[i];
 		if (ignore_submodules && S_ISGITLINK(ce->ce_mode))
 			continue;
@@ -1627,7 +1629,6 @@ int refresh_index(struct index_state *istate, unsigned int flags,
 		t2_sum_scan += t2_did_scan;
 		if (new_entry == ce)
 			continue;
-		display_progress(progress, i);
 		if (!new_entry) {
 			const char *fmt;
 
@@ -1662,7 +1663,6 @@ int refresh_index(struct index_state *istate, unsigned int flags,
 	trace2_data_intmax("index", NULL, "refresh/sum_lstat", t2_sum_lstat);
 	trace2_data_intmax("index", NULL, "refresh/sum_scan", t2_sum_scan);
 	trace2_region_leave("index", "refresh", NULL);
-	display_progress(progress, istate->cache_nr);
 	stop_progress(&progress);
 	trace_performance_leave("refresh index");
 	return has_errors;
-- 
2.32.0.rc3.434.gd8aed1f08a7