style fetch fix on editing between different blocks (#496)

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

@@ -94,7 +94,7 @@ abstract class Container<T extends Node?> extends Node {
 
     for (final node in children) {
       final len = node.length;
-      if (offset < len || (inclusive && offset == len && node.isLast)) {
+      if (offset < len || (inclusive && offset == len)) {
         return ChildQuery(node, offset);
       }
       offset -= len;

lib/src/widgets/raw_editor/raw_editor_state_text_input_client_mixin.dart

@@ -2,6 +2,7 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter/widgets.dart';
 
+import '../../models/documents/document.dart';
 import '../../utils/diff_delta.dart';
 import '../editor.dart';
 
@@ -167,8 +168,12 @@ mixin RawEditorStateTextInputClientMixin on EditorState
     final text = value.text;
     final cursorPosition = value.selection.extentOffset;
     final diff = getDiff(oldText, text, cursorPosition);
-    widget.controller.replaceText(
-        diff.start, diff.deleted.length, diff.inserted, value.selection);
+    if (diff.deleted.isEmpty && diff.inserted.isEmpty) {
+      widget.controller.updateSelection(value.selection, ChangeSource.LOCAL);
+    } else {
+      widget.controller.replaceText(
+          diff.start, diff.deleted.length, diff.inserted, value.selection);
+    }
   }
 
   @override