Add isManuallyStarted to IAnimation interface

src/Avalonia.Base/Animation/Animation.cs

@@ -295,8 +295,9 @@ namespace Avalonia.Animation
             return (newAnimatorInstances, subscriptions, animatesVisibility);
         }
 
-        IDisposable IAnimation.Apply(Animatable control, IClock? clock, IObservable<bool> match, Action? onComplete)
-            => Apply(control, clock, match, onComplete, isManuallyStarted: false);
+        IDisposable IAnimation.Apply(Animatable control, IClock? clock, IObservable<bool> match, Action? onComplete,
+            bool isManuallyStarted)
+            => Apply(control, clock, match, onComplete, isManuallyStarted);
 
         /// <inheritdoc cref="IAnimation.Apply"/>
         internal IDisposable Apply(Animatable control, IClock? clock, IObservable<bool> match, Action? onComplete,

src/Avalonia.Base/Animation/IAnimation.cs

@@ -14,7 +14,8 @@ namespace Avalonia.Animation
         /// <summary>
         /// Apply the animation to the specified control and run it when <paramref name="match" /> produces <c>true</c>.
         /// </summary>
-        internal IDisposable Apply(Animatable control, IClock? clock, IObservable<bool> match, Action? onComplete = null);
+        internal IDisposable Apply(Animatable control, IClock? clock, IObservable<bool> match,
+            Action? onComplete = null, bool isManuallyStarted = false);
 
         /// <summary>
         /// Run the animation on the specified control.

src/Avalonia.Base/Styling/StyleInstance.cs

@@ -72,7 +72,8 @@ namespace Avalonia.Styling
                 _animationTrigger ??= new LightweightSubject<bool>();
                 _animationApplyDisposables ??= new List<IDisposable>();
                 foreach (var animation in _animations)
-                    _animationApplyDisposables.Add(animation.Apply(animatable, null, _animationTrigger));
+                    _animationApplyDisposables.Add(animation.Apply(animatable, null, _animationTrigger,
+                        onComplete: null, isManuallyStarted: false));
 
                 if (_activator is null)
                     _animationTrigger.OnNext(true);