[Flutter] how to pin a task at top while allowing only two task can be pinned

I am trying to pin the task at first index whenver i clcik on pin however it seems to be not pinned at the index with the icon displayed on the top left side

void pinTask(int index) {
if (pinnedTasks.contains(index)) {
pinnedTasks.remove(index);
} else {
pinnedTasks.add(0);
var task = taskList[index];

taskList.removeAt(index);
taskList.insert(0, task);

pinnedTasks = {0};
}
update();
}
List<String> getPinnedTasks() {
return taskList.where((task) => isTaskSelected[taskList.indexOf(task)]).toList();
}
List<String> get sortedTasks {
List<String> sortedList = taskList.toList();
sortedList.sort((a, b) {
int indexA = taskList.indexOf(a);
int indexB = taskList.indexOf(b);
return pinnedTasks.contains(indexA) && !pinnedTasks.contains(indexB) ? -1 : 1;
});
return sortedList;
}


void _showOptionsDialog(BuildContext context, TaskController taskController, int index) {
showDialog(
context: context,
builder: (BuildContext context) {
return Dialog(
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.only(
topLeft: Radius.circular(10),
topRight: Radius.circular(0),
bottomLeft: Radius.circular(0),
bottomRight: Radius.circular(0),
),
),
child: SizedBox(
width: double.infinity,
height: 130,
child: Padding(
padding: EdgeInsets.all(8.0),
child: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
mainAxisSize: MainAxisSize.min,
children: [
ListTile(
leading: Icon(Icons.push_pin),
title: Text('Pin', style: TextStyle(fontSize: 14)),
//this from where i am pinning the task
onTap: () {
taskController.pinTask(index); // Pin or unpin the task
Navigator.of(context).pop(); // Close dialog
},
),

],
),
),
),
),
);
},
);
}


i have tried implemented how to pin a task while only two tasks can be pinned at the top only with the icon displayed however i am unable to display the pin icon over the task list enter image description here.The pin icon should display like also i want to implement the functionality how can i unpin the task using same methods

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