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src/App/Views/MainWindow.axaml.cs
using Avalonia.Controls; using Avalonia.Input; namespace MMirror.App.Views; public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); } protected override void OnPointerEntered(PointerEventArgs e) { base.OnPointerEntered(e); Classes.Add("active"); } protected override void OnPointerExited(PointerEventArgs e) { Classes.Remove("active"); base.OnPointerExited(e); } }