fix(resources): Don't update static resources on loading

Fix bug where static resources could be incorrectly re-resolved on loading into the visual tree. This was manifesting exclusively in the case that hot reload was active (ie in debug, but not release).

src/Uno.UI/UI/Xaml/Data/BindingHelper.cs

@@ -38,7 +38,7 @@ public static void UpdateResourceBindings(this DependencyObject instance)
 			if(instance is IDependencyObjectStoreProvider provider)
 			{
 				provider.Store.ApplyElementNameBindings();
-				provider.Store.UpdateResourceBindings(ResourceUpdateReason.StaticResourceLoading);
+				provider.Store.UpdateResourceBindings(ResourceUpdateReason.ResolvedOnLoading);
 			}
 		}
 	}

src/Uno.UI/UI/Xaml/Data/ResourceUpdateReason.cs

@@ -28,5 +28,9 @@ internal enum ResourceUpdateReason
 		/// Updates that should be propagated recursively through the visual tree
 		/// </summary>
 		PropagatesThroughTree = ThemeResource | HotReload,
+		/// <summary>
+		/// Updates that should be re-resolved when the bound object or its parent is loaded into the visual tree
+		/// </summary>
+		ResolvedOnLoading = StaticResourceLoading | ThemeResource,
 	}
 }

src/Uno.UI/UI/Xaml/DependencyObjectStore.cs

@@ -1242,6 +1242,12 @@ private void InnerUpdateResourceBindings(ResourceUpdateReason updateReason, Reso
 		[MethodImpl(MethodImplOptions.AggressiveInlining)]
 		private void InnerUpdateResourceBindingsUnsafe(ResourceUpdateReason updateReason, ResourceDictionary[] dictionariesInScope, DependencyProperty property, ResourceBinding binding)
 		{
+			if ((binding.UpdateReason & updateReason) == ResourceUpdateReason.None)
+			{
+				// If the reason for the update doesn't match the reason(s) that the binding was created for, don't update it
+				return;
+			}
+
 			var wasSet = false;
 			foreach (var dict in dictionariesInScope)
 			{
@@ -1253,7 +1259,7 @@ private void InnerUpdateResourceBindingsUnsafe(ResourceUpdateReason updateReason
 				}
 			}
 
-			if (!wasSet && (binding.UpdateReason & updateReason) != ResourceUpdateReason.None)
+			if (!wasSet)
 			{
 				if (ResourceResolver.TryTopLevelRetrieval(binding.ResourceKey, binding.ParseContext, out var value))
 				{