fix check attribute

app/assets/sample_data.json

@@ -400,5 +400,24 @@
          "list":"bullet"
       },
       "insert":"\n"
+   },
+   },
+   {
+      "insert": "this is a check list"
+   },
+   {
+      "attributes": {
+         "list": "checked"
+      },
+      "insert": "\n"
+   },
+   {
+      "insert": "this is a uncheck list"
+   },
+   {
+      "attributes": {
+         "list": "unchecked"
+      },
+      "insert": "\n"
    }
 ]

lib/models/documents/attribute.dart

@@ -4,7 +4,7 @@ enum AttributeScope {
   INLINE, // refer to https://quilljs.com/docs/formats/#inline
   BLOCK, // refer to https://quilljs.com/docs/formats/#block
   EMBEDS, // refer to https://quilljs.com/docs/formats/#embeds
-  IGNORE, // atttributes that can be igored
+  IGNORE, // attributes that can be ignored
 }
 
 class Attribute<T> {
@@ -116,8 +116,11 @@ class Attribute<T> {
   // "attributes":{"list":"ordered"}
   static Attribute<String> get ol => ListAttribute('ordered');
 
-  // "attributes":{"list":"check"}
-  static Attribute<String> get check => ListAttribute('check');
+  // "attributes":{"list":"checked"}
+  static Attribute<String> get checked => ListAttribute('checked');
+
+  // "attributes":{"list":"unchecked"}
+  static Attribute<String> get unchecked => ListAttribute('unchecked');
 
   // "attributes":{"indent":1"}
   static Attribute<int> get indentL1 => IndentAttribute(level: 1);