Refer 65532 to class Embed

lib/src/models/documents/nodes/leaf.dart

@@ -244,7 +244,9 @@ class Text extends Leaf {
 class Embed extends Leaf {
   Embed(Embeddable data) : super.val(data);
 
+  // Refer to https://www.fileformat.info/info/unicode/char/fffc/index.htm
   static const kObjectReplacementCharacter = '\uFFFC';
+  static const kObjectReplacementInt = 65532;
 
   @override
   Node newInstance() => throw UnimplementedError();

lib/src/widgets/raw_editor/raw_editor_state_selection_delegate_mixin.dart

@@ -3,6 +3,7 @@ import 'dart:math' as math;
 import 'package:flutter/rendering.dart';
 import 'package:flutter/widgets.dart';
 
+import '../../models/documents/nodes/leaf.dart';
 import '../../utils/delta.dart';
 import '../editor.dart';
 
@@ -26,16 +27,16 @@ mixin RawEditorStateSelectionDelegateMixin on EditorState
   }
 
   String _adjustInsertedText(String text) {
-    // For clip from editor, it may contain image, a.k.a 65532.
+    // For clip from editor, it may contain image, a.k.a 65532 or '\uFFFC'.
     // For clip from browser, image is directly ignore.
     // Here we skip image when pasting.
-    if (!text.codeUnits.contains(65532)) {
+    if (!text.codeUnits.contains(Embed.kObjectReplacementInt)) {
       return text;
     }
 
     final sb = StringBuffer();
     for (var i = 0; i < text.length; i++) {
-      if (text.codeUnitAt(i) == 65532) {
+      if (text.codeUnitAt(i) == Embed.kObjectReplacementInt) {
         continue;
       }
       sb.write(text[i]);