Update Uno version, Uno TFMs to .NET 8 (#422)

* Update tooling pointer

* Fixed new net8.0 compiler warnings/errors

* Update tooling pointer

* Align Android TFM with Uno.UI

* Use net8.0-android34.0 for Android TFM

* Fixed possible nullrefs on wasdk

* Fixed possible nullrefs on WinAppSdk

* Fixed WinUIMajorVersion for single-component Wasdk head

* Update tooling pointer to latest main

components/Animations/src/Extensions/CompositorExtensions.cs

@@ -109,7 +109,9 @@ public static BooleanKeyFrameAnimation CreateBooleanKeyFrameAnimation(
             animation.InsertKeyFrame(0, from.Value);
         }
 
-        animation.Target = target;
+        if (target is not null)
+            animation.Target = target;
+
         animation.Direction = direction;
         animation.IterationBehavior = iterationBehavior;
         animation.IterationCount = iterationCount;
@@ -170,7 +172,9 @@ public static ScalarKeyFrameAnimation CreateScalarKeyFrameAnimation(
             animation.InsertKeyFrame(0, from.Value);
         }
 
-        animation.Target = target;
+        if (target is not null)
+            animation.Target = target;
+
         animation.Direction = direction;
         animation.IterationBehavior = iterationBehavior;
         animation.IterationCount = iterationCount;
@@ -231,7 +235,9 @@ public static Vector2KeyFrameAnimation CreateVector2KeyFrameAnimation(
             animation.InsertKeyFrame(0, from.Value);
         }
 
-        animation.Target = target;
+        if (target is not null)
+            animation.Target = target;
+
         animation.Direction = direction;
         animation.IterationBehavior = iterationBehavior;
         animation.IterationCount = iterationCount;
@@ -292,7 +298,9 @@ public static Vector3KeyFrameAnimation CreateVector3KeyFrameAnimation(
             animation.InsertKeyFrame(0, from.Value);
         }
 
-        animation.Target = target;
+        if (target is not null)
+            animation.Target = target;
+
         animation.Direction = direction;
         animation.IterationBehavior = iterationBehavior;
         animation.IterationCount = iterationCount;
@@ -353,7 +361,9 @@ public static Vector4KeyFrameAnimation CreateVector4KeyFrameAnimation(
             animation.InsertKeyFrame(0, from.Value);
         }
 
-        animation.Target = target;
+        if (target is not null)
+            animation.Target = target;
+
         animation.Direction = direction;
         animation.IterationBehavior = iterationBehavior;
         animation.IterationCount = iterationCount;
@@ -414,7 +424,9 @@ public static ColorKeyFrameAnimation CreateColorKeyFrameAnimation(
             animation.InsertKeyFrame(0, from.Value);
         }
 
-        animation.Target = target;
+        if (target is not null)
+            animation.Target = target;
+
         animation.Direction = direction;
         animation.IterationBehavior = iterationBehavior;
         animation.IterationCount = iterationCount;
@@ -475,7 +487,9 @@ public static QuaternionKeyFrameAnimation CreateQuaternionKeyFrameAnimation(
             animation.InsertKeyFrame(0, from.Value);
         }
 
-        animation.Target = target;
+        if (target is not null)
+            animation.Target = target;
+
         animation.Direction = direction;
         animation.IterationBehavior = iterationBehavior;
         animation.IterationCount = iterationCount;

components/Extensions/src/Element/FrameworkElementExtensions.Mouse.cs

@@ -101,6 +101,7 @@ private static void Element_PointerEntered(object sender, PointerRoutedEventArgs
         CursorShape cursor = GetCursor((FrameworkElement)sender);
 
 #if !WINAPPSDK
+    if (Window.Current?.CoreWindow is not null)
         Window.Current.CoreWindow.PointerCursor = _cursors[cursor];
 #endif
     }
@@ -124,6 +125,7 @@ private static void Element_PointerExited(object sender, PointerRoutedEventArgs
         }
 
 #if !WINAPPSDK
+    if (Window.Current?.CoreWindow is not null)
         Window.Current.CoreWindow.PointerCursor = cursor;
 #endif
     }
@@ -138,6 +140,7 @@ private static void ElementOnUnloaded(object sender, RoutedEventArgs routedEvent
         // when the element is programatically unloaded, reset the cursor back to default
         // this is necessary when click triggers immediate change in layout and PointerExited is not called
 #if !WINAPPSDK
+    if (Window.Current?.CoreWindow is not null)
         Window.Current.CoreWindow.PointerCursor = _defaultCursor;
 #endif
     }

components/Helpers/src/ThemeListener.cs

@@ -76,7 +76,7 @@ public ThemeListener(DispatcherQueue? dispatcherQueue = null)
 
         DispatcherQueue = dispatcherQueue ?? DispatcherQueue.GetForCurrentThread();
 
-        if (Window.Current != null)
+        if (Window.Current?.CoreWindow is not null)
         {
             _accessible.HighContrastChanged += Accessible_HighContrastChanged;
             _settings.ColorValuesChanged += Settings_ColorValuesChanged;
@@ -163,7 +163,7 @@ public void Dispose()
     {
         _accessible.HighContrastChanged -= Accessible_HighContrastChanged;
         _settings.ColorValuesChanged -= Settings_ColorValuesChanged;
-        if (Window.Current != null)
+        if (Window.Current?.CoreWindow is not null)
         {
             Window.Current.CoreWindow.Activated -= CoreWindow_Activated;
         }