Fix bug in HTML paste functionality

CHANGELOG.md

@@ -4,6 +4,7 @@ All notable changes to this project will be documented in this file.
 
 ## 9.1.1
 * Fix bug [#1636](https://github.com/singerdmx/flutter-quill/issues/1636)
+* Fix a where you paste styled content (HTML) it always insert a new line at first even if the document is empty
 
 ## 9.1.0
 * Fix the simple toolbar by add properties of `IconButton` and fix some buttons

lib/src/models/documents/document.dart

@@ -405,7 +405,8 @@ class Document {
 
   void _loadDocument(Delta doc) {
     if (doc.isEmpty) {
-      throw ArgumentError.value(doc, 'Document Delta cannot be empty.');
+      throw ArgumentError.value(
+          doc.toString(), 'Document Delta cannot be empty.');
     }
 
     // print(doc.last.data.runtimeType);

lib/src/widgets/raw_editor/raw_editor_state.dart

@@ -21,6 +21,7 @@ import 'package:flutter_keyboard_visibility/flutter_keyboard_visibility.dart'
     show KeyboardVisibilityController;
 import 'package:super_clipboard/super_clipboard.dart';
 
+import '../../../quill_delta.dart';
 import '../../models/documents/attribute.dart';
 import '../../models/documents/document.dart';
 import '../../models/documents/nodes/block.dart';
@@ -214,11 +215,15 @@ class QuillRawEditorState extends EditorState
         return;
       }
       final deltaFromCliboard = Document.fromHtml(html);
-      final delta = deltaFromCliboard.compose(controller.document.toDelta());
+      var newDelta = Delta();
+      newDelta = newDelta.compose(deltaFromCliboard);
+      if (!controller.document.isEmpty()) {
+        newDelta = newDelta.compose(controller.document.toDelta());
+      }
 
       controller
         ..setContents(
-          delta,
+          newDelta,
         )
         ..updateSelection(
           TextSelection.collapsed(