From ec55f3c08b86e951c795230eefc5d6de9dfb19af Mon Sep 17 00:00:00 2001
From: Raman Paulau <rspaulau@gmail.com>
Date: Wed, 13 Sep 2023 10:22:43 -0700
Subject: [PATCH] inspect `appendedTransaction` for possible `addToHistory:
 false` meta to prevent transaction from appearing on undo stack. fixes #141

---
 src/plugins/sync-plugin.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/plugins/sync-plugin.js b/src/plugins/sync-plugin.js
index 3e3b6aa..1fcf5f5 100644
--- a/src/plugins/sync-plugin.js
+++ b/src/plugins/sync-plugin.js
@@ -126,7 +126,8 @@ export const ySyncPlugin = (yXmlFragment, {
             pluginState[key] = change[key]
           }
         }
-        pluginState.addToHistory = tr.getMeta('addToHistory') !== false
+        const appended = tr.getMeta('appendedTransaction')
+        pluginState.addToHistory = tr.getMeta('addToHistory') !== false && !(appended && appended.getMeta('addToHistory') === false)
         // always set isChangeOrigin. If undefined, this is not change origin.
         pluginState.isChangeOrigin = change !== undefined &&
           !!change.isChangeOrigin