diff --git a/lib/models/documents/history.dart b/lib/models/documents/history.dart
index 8ac402d3..e0d26948 100644
--- a/lib/models/documents/history.dart
+++ b/lib/models/documents/history.dart
@@ -92,11 +92,10 @@ class History {
     // look for insert or delete
     int len = 0;
     List<Operation> ops = delta.toList();
-    for(var i = 0; i < ops.length; i++){
-      if (ops[i].key == Operation.insertKey){
+    for (var i = 0; i < ops.length; i++) {
+      if (ops[i].key == Operation.insertKey) {
         len = ops[i].length;
-      }
-      else if (ops[i].key == Operation.deleteKey){
+      } else if (ops[i].key == Operation.deleteKey) {
         len = ops[i].length * -1;
       }
     }
diff --git a/lib/widgets/controller.dart b/lib/widgets/controller.dart
index 650f6337..9ce00ca8 100644
--- a/lib/widgets/controller.dart
+++ b/lib/widgets/controller.dart
@@ -44,19 +44,20 @@ class QuillController extends ChangeNotifier {
 
   void undo() {
     Tuple2 tup = document.undo();
-    if (tup.item1){
+    if (tup.item1) {
       _handleHistoryChange(tup.item2);
     }
   }
 
   void _handleHistoryChange(int len) {
     if (len != 0) {
-    // if (this.selection.extentOffset >= document.length) {
+      // if (this.selection.extentOffset >= document.length) {
       // // cursor exceeds the length of document, position it in the end
       // updateSelection(
       //     TextSelection.collapsed(offset: document.length), ChangeSource.LOCAL);
       updateSelection(
-          TextSelection.collapsed(offset: this.selection.baseOffset + len), ChangeSource.LOCAL);
+          TextSelection.collapsed(offset: this.selection.baseOffset + len),
+          ChangeSource.LOCAL);
     } else {
       // no need to move cursor
       notifyListeners();
@@ -65,7 +66,7 @@ class QuillController extends ChangeNotifier {
 
   void redo() {
     Tuple2 tup = document.redo();
-    if (tup.item1){
+    if (tup.item1) {
       _handleHistoryChange(tup.item2);
     }
   }