From 141a96e2213a2de0ac042616b04e2a8adfb551dc Mon Sep 17 00:00:00 2001
From: Damien Elmes <gpg@ankiweb.net>
Date: Sat, 31 Jul 2021 18:30:50 +1000
Subject: [PATCH] fix inability to map fields from larger to smaller notetype

We were using the new item count instead of the old one.

https://forums.ankiweb.net/t/issue-changing-note-type-on-2-1-45/11822
---
 ts/change-notetype/lib.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ts/change-notetype/lib.ts b/ts/change-notetype/lib.ts
index 84661db38..5c612049d 100644
--- a/ts/change-notetype/lib.ts
+++ b/ts/change-notetype/lib.ts
@@ -178,7 +178,8 @@ export class ChangeNotetypeState {
 
     setOldIndex(ctx: MapContext, newIdx: number, oldIdx: number): void {
         const list = this.info_.mapForContext(ctx);
-        const realOldIdx = oldIdx < list.length ? oldIdx : null;
+        const oldNames = this.info_.getOldNames(ctx);
+        const realOldIdx = oldIdx < oldNames.length ? oldIdx : null;
         const allowDupes = ctx == MapContext.Field;
 
         // remove any existing references?