Minor cleanup

packages/zefyr/CHANGELOG.md

+## 0.9.1
+
+* Fixed: Preserve inline style when replacing formatted text from the first character (#201)
+
 ## 0.9.0
 
 * Feature: toggle inline styles (works for bold and italic)

packages/zefyr/lib/src/widgets/controller.dart

       // some style, then we apply it to our document.
       if (delta != null &&
           toggledStyles.isNotEmpty &&
-          delta.length <=2 &&
+          delta.isNotEmpty &&
+          delta.length <= 2 &&
           delta.last.isInsert) {
         // Apply it.
         Delta retainDelta = Delta()

packages/zefyr/pubspec.yaml

 name: zefyr
 description: Clean, minimalistic and collaboration-ready rich text editor for Flutter.
-version: 0.9.0
+version: 0.9.1
 author: Anatoly Pulyaevskiy <anatoly.pulyaevskiy@gmail.com>
 homepage: https://github.com/memspace/zefyr
 

packages/zefyr/test/widgets/controller_test.dart

       var result = controller.getSelectionStyle();
       expect(result.values, [NotusAttribute.bold]);
     });
-    test('formatText with toggled style for first charater', () {
+
+    test('preserve inline format when replacing text from the first character',
+        () {
       bool notified = false;
       controller.addListener(() {
         notified = true;