From 1980b87246c7099e9191890036398960f6dee4d1 Mon Sep 17 00:00:00 2001
From: Philipp Takacs <philipp@bureaucracy.de>
Date: Wed, 18 Mar 2020 19:53:25 +0100
Subject: [PATCH] seq_read and seq_list also recognise msg which don't exist

This allows better handling of raceconditions, like a new mail gets
deliverd while a unreed mail is shown.
---
 sbr/seq_list.c                     |   12 ++++--------
 sbr/seq_read.c                     |    9 +++++++--
 test/tests/show/test-unseen-update |   13 ++++++++++---
 3 files changed, 21 insertions(+), 13 deletions(-)

diff --git a/sbr/seq_list.c b/sbr/seq_list.c
index 3606f6f..ce23c22 100644
--- a/sbr/seq_list.c
+++ b/sbr/seq_list.c
@@ -54,12 +54,9 @@ seq_list(struct msgs *mp, char *seqname)
 
 	bp = buffer;
 
-	for (i = mp->lowmsg; i <= mp->hghmsg; ++i) {
-		/*
-		** If message doesn't exist, or isn't in
-		** the sequence, then continue.
-		*/
-		if (!does_exist(mp, i) || !in_sequence(mp, seqnum, i))
+	for (i = mp->lowoff; i <= mp->hghoff; ++i) {
+		/* If message isn't in the sequence, then continue */
+		if (!in_sequence(mp, seqnum, i))
 			continue;
 
 		/*
@@ -91,8 +88,7 @@ seq_list(struct msgs *mp, char *seqname)
 		/*
 		** Scan to the end of this message range
 		*/
-		for (++i; i <= mp->hghmsg && does_exist(mp, i) &&
-				in_sequence(mp, seqnum, i); ++i)
+		for (++i; i <= mp->hghoff && in_sequence(mp, seqnum, i); ++i)
 			;
 
 		if (i - j > 1) {
diff --git a/sbr/seq_read.c b/sbr/seq_read.c
index 041f632..4cc4223 100644
--- a/sbr/seq_read.c
+++ b/sbr/seq_read.c
@@ -210,9 +210,14 @@ seq_init(struct msgs *mp, char *name, char *field)
 			** We iterate through messages in this range
 			** and flip on bit for this sequence.
 			*/
+			if (k > mp->hghoff) {
+				if (!(mp = folder_realloc(mp, mp->lowoff, k))) {
+					adios(EX_OSERR, NULL, "unable to allocate folder storage");
+				}
+				mp->hghoff = k;
+			}
 			for (; j <= k; j++) {
-				if (j >= mp->lowmsg && j <= mp->hghmsg &&
-						does_exist(mp, j))
+				if (j >= mp->lowmsg && j <= mp->hghoff)
 					add_sequence(mp, i, j);
 			}
 		}
diff --git a/test/tests/show/test-unseen-update b/test/tests/show/test-unseen-update
index a4875c4..61e317e 100644
--- a/test/tests/show/test-unseen-update
+++ b/test/tests/show/test-unseen-update
@@ -24,7 +24,14 @@ runandcheck "pick u" <<!
 8
 9
 !
-mark -sequence u -add -nozero 10
+
+#add a new mail
+rcvstore <<!
+From: test
+To: test
+
+testmail
+!
 runandcheck "pick u" <<!
 1
 2
@@ -35,12 +42,12 @@ runandcheck "pick u" <<!
 7
 8
 9
-10
+11
 !
 pkill -P $pagerpid
 wait $pagerpid
 
 runandcheck "pick u" <<!
 9
-10
+11
 !
-- 
1.7.10.4