From 38299176abea74b8ae3087393fea640db5074bcc Mon Sep 17 00:00:00 2001
From: ritheshSalyan <rithesh199.rr@gmail.com>
Date: Fri, 19 Feb 2021 23:16:58 +0530
Subject: [PATCH] support for custom non-styling attribute

---
 .vscode/launch.json                 | 15 +++++++++++++++
 lib/models/documents/attribute.dart |  3 ++-
 lib/models/documents/style.dart     |  2 +-
 lib/widgets/toolbar.dart            |  1 +
 4 files changed, 19 insertions(+), 2 deletions(-)
 create mode 100644 .vscode/launch.json

diff --git a/.vscode/launch.json b/.vscode/launch.json
new file mode 100644
index 00000000..f9c59272
--- /dev/null
+++ b/.vscode/launch.json
@@ -0,0 +1,15 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "flutter-quill",
+            "request": "launch",
+            "type": "dart",
+            "program": "app/lib/main.dart"
+        },
+       
+    ]
+}
\ No newline at end of file
diff --git a/lib/models/documents/attribute.dart b/lib/models/documents/attribute.dart
index 5f55e035..ec9ca9d8 100644
--- a/lib/models/documents/attribute.dart
+++ b/lib/models/documents/attribute.dart
@@ -155,7 +155,8 @@ class Attribute<T> {
 
   static Attribute fromKeyValue(String key, dynamic value) {
     if (!_registry.containsKey(key)) {
-      throw ArgumentError.value(key, 'key "$key" not found.');
+       return null;
+      // throw ArgumentError.value(key, 'key "$key" not found.');
     }
     Attribute origin = _registry[key];
     Attribute attribute = clone(origin, value);
diff --git a/lib/models/documents/style.dart b/lib/models/documents/style.dart
index cd05cd03..68825790 100644
--- a/lib/models/documents/style.dart
+++ b/lib/models/documents/style.dart
@@ -17,7 +17,7 @@ class Style {
 
     Map<String, Attribute> result = attributes.map((String key, dynamic value) {
       Attribute attr = Attribute.fromKeyValue(key, value);
-      return MapEntry<String, Attribute>(key, attr);
+      return MapEntry<String, Attribute>(key, attr??Attribute(key, AttributeScope.INLINE, value));
     });
     return Style.attr(result);
   }
diff --git a/lib/widgets/toolbar.dart b/lib/widgets/toolbar.dart
index 69de725a..d7b4ab78 100644
--- a/lib/widgets/toolbar.dart
+++ b/lib/widgets/toolbar.dart
@@ -742,6 +742,7 @@ class _HistoryButtonState extends State<HistoryButton> {
   }
 
   void _setIconColor() {
+    if(!mounted) return;
     if (widget.undo) {
       setState(() {
         _iconColor = widget.controller.hasUndo