From bc5eb86a8f623bb2426a095835b2a72bb117ebd3 Mon Sep 17 00:00:00 2001
From: Xin Yao <singerdmx@gmail.com>
Date: Thu, 22 Apr 2021 16:25:35 -0700
Subject: [PATCH] Indent attribute is consider block but may have null value

---
 lib/models/documents/nodes/line.dart | 2 +-
 lib/models/documents/style.dart      | 9 +++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/lib/models/documents/nodes/line.dart b/lib/models/documents/nodes/line.dart
index ec933b52..632d44d1 100644
--- a/lib/models/documents/nodes/line.dart
+++ b/lib/models/documents/nodes/line.dart
@@ -197,7 +197,7 @@ class Line extends Container<Leaf?> {
     }
 
     applyStyle(newStyle);
-    final blockStyle = newStyle.getBlockExceptHeader();
+    final blockStyle = newStyle.getNotNullValueBlockExceptHeader();
     if (blockStyle == null) {
       return;
     } // No block-level changes
diff --git a/lib/models/documents/style.dart b/lib/models/documents/style.dart
index c805280d..4efce0f2 100644
--- a/lib/models/documents/style.dart
+++ b/lib/models/documents/style.dart
@@ -56,6 +56,15 @@ class Style {
     return null;
   }
 
+  Attribute? getNotNullValueBlockExceptHeader() {
+    for (final val in values) {
+      if (val.isBlockExceptHeader && val.value != null) {
+        return val;
+      }
+    }
+    return null;
+  }
+
   Style merge(Attribute attribute) {
     final merged = Map<String, Attribute>.from(_attributes);
     if (attribute.value == null) {