Fix a bug that empty delta would be treated as retain and cause cursor to not move

CHANGELOG.md

@@ -66,4 +66,7 @@
 * Support custom styles and image on local device storage without uploading.
 
 ## [0.2.4]
-* Support the use of custom icon size in toolbar.
+* Support the use of custom icon size in toolbar.
+
+## [0.2.5]
+* Toggle text/background color button in toolbar.

app/pubspec.lock

@@ -82,7 +82,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "0.2.4"
+    version: "0.2.5"
   flutter_test:
     dependency: "direct dev"
     description: flutter

lib/utils/diff_delta.dart

@@ -67,6 +67,10 @@ Diff getDiff(String oldText, String newText, int cursorPosition) {
 }
 
 int getPositionDelta(Delta user, Delta actual) {
+  if (actual.isEmpty) {
+    return 0;
+  }
+
   DeltaIterator userItr = DeltaIterator(user);
   DeltaIterator actualItr = DeltaIterator(actual);
   int diff = 0;

lib/widgets/controller.dart

@@ -100,7 +100,7 @@ class QuillController extends ChangeNotifier {
 
     toggledStyle = Style();
     if (textSelection != null) {
-      if (delta == null) {
+      if (delta == null || delta.isEmpty) {
         _updateSelection(textSelection, ChangeSource.LOCAL);
       } else {
         try {

pubspec.yaml

@@ -1,6 +1,6 @@
 name: flutter_quill
 description: One client and affiliated collaborator of Flutter Quill is Bullet Journal App.
-version: 0.2.4
+version: 0.2.5
 #author: bulletjournal
 homepage: https://bulletjournal.us/home/index.html
 repository: https://github.com/singerdmx/flutter-quill.git