dart fixes

lib/src/document/nodes/line.dart

@@ -527,10 +527,10 @@ base class Line extends QuillContainer<Leaf?> {
       // returning Embed.kObjectReplacementCharacter for the buffer
       final action = provider.getCopyCutAction(embed.type);
       final data = action?.call(embed.data);
-      if(data is String && data != Embed.kObjectReplacementCharacter){
+      if (data is String && data != Embed.kObjectReplacementCharacter) {
         buffer.write(data);
         return remaining;
-      } else{
+      } else {
         buffer.write(action?.call(data));
       }
       return remaining - node.length;