From 350d7bcfb038c90079a3002e0630a0554e1322f9 Mon Sep 17 00:00:00 2001
From: Nicolas Dion-Bouchard <nicolas.dionbouchard@gmail.com>
Date: Mon, 7 Feb 2022 16:16:59 -0500
Subject: [PATCH] Fix for undoing a modification ending with an indented line
 (#656)

Co-authored-by: Nicolas Dion Bouchard <nicolas.dionbouchard@sviesolutions.com>
---
 lib/src/models/rules/insert.dart | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/src/models/rules/insert.dart b/lib/src/models/rules/insert.dart
index f1db6318..70c1e63e 100644
--- a/lib/src/models/rules/insert.dart
+++ b/lib/src/models/rules/insert.dart
@@ -115,7 +115,11 @@ class PreserveBlockStyleOnInsertRule extends InsertRule {
         delta.insert('\n', lineStyle.toJson());
       } else if (i < lines.length - 1) {
         // we don't want to insert a newline after the last chunk of text, so -1
-        delta.insert('\n', blockStyle);
+        final blockAttributes = blockStyle.isEmpty
+            ? null
+            : blockStyle.map<String, dynamic>((_, attribute) =>
+                MapEntry<String, dynamic>(attribute.key, attribute.value));
+        delta.insert('\n', blockAttributes);
       }
     }