[geary/mjog/invert-folder-class-hierarchy] fixup expand vector op

[Michael Gratton <mjog src gnome org>]

commit 5bc7f4858cd4776e90d4440c884d4709c3af930d
Author: Michael Gratton <mike vee net>
Date:   Sun Mar 7 21:26:21 2021 +1100

    fixup expand vector op

 src/engine/imap-engine/replay-ops/imap-engine-expand-vector.vala | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/src/engine/imap-engine/replay-ops/imap-engine-expand-vector.vala 
b/src/engine/imap-engine/replay-ops/imap-engine-expand-vector.vala
index 9c4184eb3..4e2403c78 100644
--- a/src/engine/imap-engine/replay-ops/imap-engine-expand-vector.vala
+++ b/src/engine/imap-engine/replay-ops/imap-engine-expand-vector.vala
@@ -74,7 +74,7 @@ private class Geary.ImapEngine.ExpandVector : ReplayOperation {
             high_pos = remote.folder.properties.email_total;
         }
 
-        low_pos = high_pos - target;
+        low_pos = high_pos - target + 1;
         if (low_pos < Imap.SequenceNumber.MIN) {
             low_pos = Imap.SequenceNumber.MIN;
         }
@@ -155,7 +155,6 @@ private class Geary.ImapEngine.ExpandVector : ReplayOperation {
                     created_ids.add(email.id);
                 }
             }
-
             if (!created_ids.is_empty) {
                 this.engine.email_inserted(created_ids);
             }