Merge branch 'master' into fixes/textProcessing

src/Avalonia.Base/Animation/Animatable.cs

@@ -27,6 +27,7 @@ namespace Avalonia.Animation
             AvaloniaProperty.Register<Animatable, Transitions?>(nameof(Transitions));
 
         private bool _transitionsEnabled = true;
+        private bool _isSubscribedToTransitionsCollection = false;
         private Dictionary<ITransition, TransitionState>? _transitionState;
 
         /// <summary>
@@ -62,6 +63,11 @@ namespace Avalonia.Animation
 
                 if (Transitions is object)
                 {
+                    if (!_isSubscribedToTransitionsCollection)
+                    {
+                        _isSubscribedToTransitionsCollection = true;
+                        Transitions.CollectionChanged += TransitionsCollectionChanged;
+                    }
                     AddTransitions(Transitions);
                 }
             }
@@ -72,7 +78,7 @@ namespace Avalonia.Animation
         /// </summary>
         /// <remarks>
         /// This method should not be called from user code, it will be called automatically by the framework
-        /// when a control is added to the visual tree.
+        /// when a control is removed from the visual tree.
         /// </remarks>
         protected void DisableTransitions()
         {
@@ -82,6 +88,11 @@ namespace Avalonia.Animation
 
                 if (Transitions is object)
                 {
+                    if (_isSubscribedToTransitionsCollection)
+                    {
+                        _isSubscribedToTransitionsCollection = false;
+                        Transitions.CollectionChanged -= TransitionsCollectionChanged;
+                    }
                     RemoveTransitions(Transitions);
                 }
             }
@@ -110,6 +121,7 @@ namespace Avalonia.Animation
                     }
 
                     newTransitions.CollectionChanged += TransitionsCollectionChanged;
+                    _isSubscribedToTransitionsCollection = true;
                     AddTransitions(toAdd);
                 }
 

src/Avalonia.Base/Data/InstancedBinding.cs

@@ -23,7 +23,7 @@ namespace Avalonia.Data
         /// <param name="priority">The priority of the binding.</param>
         /// <remarks>
         /// This constructor can be used to create any type of binding and as such requires an
-        /// <see cref="ISubject{Object}"/> as the binding source because this is the only binding
+        /// <see cref="IObservable{Object}"/> as the binding source because this is the only binding
         /// source which can be used for all binding modes. If you wish to create an instance with
         /// something other than a subject, use one of the static creation methods on this class.
         /// </remarks>

src/Avalonia.Base/Metadata/InheritDataTypeFromItemsAttribute.cs

@@ -25,9 +25,9 @@ public sealed class InheritDataTypeFromItemsAttribute : Attribute
     /// The name of the property whose item type should be used on the target property.
     /// </summary>
     public string AncestorItemsProperty { get; }
-    
+
     /// <summary>
-    /// The ancestor type to be used in a lookup for the <see cref="AncestorProperty"/>.
+    /// The ancestor type to be used in a lookup for the <see cref="AncestorItemsProperty"/>.
     /// If null, the declaring type of the target property is used.
     /// </summary>
     public Type? AncestorType { get; set; }

src/Avalonia.Base/Rendering/SceneGraph/IDrawOperation.cs

@@ -19,7 +19,7 @@ namespace Avalonia.Rendering.SceneGraph
         /// <param name="p">The point in global coordinates.</param>
         /// <returns>True if the point hits the node's geometry; otherwise false.</returns>
         /// <remarks>
-        /// This method does not recurse to child <see cref="IVisualNode"/>s, if you want
+        /// This method does not recurse to childs, if you want
         /// to hit test children they must be hit tested manually.
         /// </remarks>
         bool HitTest(Point p);

src/Avalonia.Controls/Automation/Peers/ListItemAutomationPeer.cs

@@ -1,5 +1,4 @@
-using System;
-using Avalonia.Automation.Provider;
+using Avalonia.Automation.Provider;
 using Avalonia.Controls;
 using Avalonia.Controls.Primitives;
 using Avalonia.Controls.Selection;
@@ -64,7 +63,7 @@ namespace Avalonia.Automation.Peers
             if (Owner.Parent is ItemsControl parent &&
                 parent.GetValue(ListBox.SelectionProperty) is ISelectionModel selectionModel)
             {
-                var index = parent.ItemContainerGenerator.IndexFromContainer(Owner);
+                var index = parent.IndexFromContainer(Owner);
 
                 if (index != -1)
                     selectionModel.Deselect(index);

src/Avalonia.Controls/TreeViewItem.cs

@@ -257,7 +257,7 @@ namespace Avalonia.Controls
                 Dispatcher.UIThread.Post(this.BringIntoView); // must use the Dispatcher, otherwise the TreeView doesn't scroll
             }
         }
-        
+
         /// <summary>
         /// Invoked when the <see cref="InputElement.DoubleTapped"/> event occurs in the header.
         /// </summary>

src/Linux/Avalonia.LinuxFramebuffer/LinuxFramebufferPlatform.cs

@@ -154,7 +154,7 @@ public static class LinuxFramebufferPlatformExtensions
         var lifetime = LinuxFramebufferPlatform.Initialize(builder, outputBackend, inputBackend);
         builder.SetupWithLifetime(lifetime);
         lifetime.Start(args);
-        builder.Instance.Run(lifetime.Token);
+        builder.Instance!.Run(lifetime.Token);
         return lifetime.ExitCode;
     }
 }

src/Linux/Avalonia.LinuxFramebuffer/Output/DrmOutput.cs

@@ -43,13 +43,13 @@ namespace Avalonia.LinuxFramebuffer.Output
         public IPlatformGraphics PlatformGraphics { get; private set; }
 
         public DrmOutput(DrmCard card, DrmResources resources, DrmConnector connector, DrmModeInfo modeInfo,
-            DrmOutputOptions? options = null)
+            DrmOutputOptions options = null)
         {
             if(options != null) 
                 _outputOptions = options;
             Init(card, resources, connector, modeInfo);
         }
-        public DrmOutput(string path = null, bool connectorsForceProbe = false, DrmOutputOptions? options = null)
+        public DrmOutput(string path = null, bool connectorsForceProbe = false, DrmOutputOptions options = null)
         {
             if(options != null) 
                 _outputOptions = options;
@@ -63,7 +63,7 @@ namespace Avalonia.LinuxFramebuffer.Output
             if(connector == null)
                 throw new InvalidOperationException("Unable to find connected DRM connector");
 
-            DrmModeInfo? mode = null;
+            DrmModeInfo mode = null;
 
             if (options?.VideoMode != null)
             {