fix: memory leak caused by animation

src/Views/PopupRunningStatus.axaml.cs

@@ -0,0 +1,70 @@
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Controls.Shapes;
+using Avalonia.Interactivity;
+using Avalonia.Media;
+
+namespace SourceGit.Views
+{
+    public partial class PopupRunningStatus : UserControl
+    {
+        public static readonly StyledProperty<string> DescriptionProperty =
+            AvaloniaProperty.Register<PopupRunningStatus, string>(nameof(Description));
+
+        public string Description
+        {
+            get => GetValue(DescriptionProperty);
+            set => SetValue(DescriptionProperty, value);
+        }
+
+        public PopupRunningStatus()
+        {
+            InitializeComponent();
+        }
+
+        protected override void OnLoaded(RoutedEventArgs e)
+        {
+            base.OnLoaded(e);
+
+            if (IsVisible)
+                StartAnim();
+        }
+
+        protected override void OnUnloaded(RoutedEventArgs e)
+        {
+            StopAnim();
+            base.OnUnloaded(e);
+        }
+
+        protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs change)
+        {
+            base.OnPropertyChanged(change);
+
+            if (change.Property == IsVisibleProperty)
+            {
+                if (IsVisible)
+                    StartAnim();
+                else
+                    StopAnim();
+            }
+        }
+
+        private void StartAnim()
+        {
+            icon.Content = new Path()
+            {
+                Data = this.FindResource("Icons.Loading") as StreamGeometry,
+                Classes = { "rotating" },
+            };
+            progressBar.IsIndeterminate = true;
+        }
+
+        private void StopAnim()
+        {
+            if (icon.Content is Path path)
+                path.Classes.Clear();
+            icon.Content = null;
+            progressBar.IsIndeterminate = false;
+        }
+    }
+}