Set not previewer flag early (#8406)

Xamarin.Forms.Platform.Android/AppCompat/FormsAppCompatActivity.cs

@@ -265,6 +265,7 @@ namespace Xamarin.Forms.Platform.Android
 				_powerSaveModeBroadcastReceiver = new PowerSaveModeBroadcastReceiver();
 			}
 
+			ContextExtensions.SetDesignerContext(_layout);
 			Profile.FrameEnd();
 		}
 
@@ -433,7 +434,6 @@ namespace Xamarin.Forms.Platform.Android
 			PopupManager.ResetBusyCount(this);
 
 			Platform = new AppCompat.Platform(this);
-
 			Platform.SetPage(page);
 			_layout.AddView(Platform);
 			_layout.BringToFront();

Xamarin.Forms.Platform.Android/ContextExtensions.cs

@@ -130,14 +130,32 @@ namespace Xamarin.Forms.Platform.Android
 			if (_isDesignerContext.HasValue)
 				return _isDesignerContext.Value;
 
+			context.SetDesignerContext();
+			return _isDesignerContext.Value;
+		}
+
+		internal static void SetDesignerContext(this Context context)
+		{
+			if (_isDesignerContext.HasValue)
+				return;
+
 			if (context == null)
 				_isDesignerContext = false;
 			else if ($"{context}".Contains("com.android.layoutlib.bridge.android.BridgeContext"))
 				_isDesignerContext = true;
-			else if (context is ContextWrapper contextWrapper)
-				return contextWrapper.BaseContext.IsDesignerContext();
 			else
 				_isDesignerContext = false;
+		}
+
+		internal static void SetDesignerContext(global::Android.Views.View view)
+		{
+			_isDesignerContext = view.IsInEditMode;
+		}
+
+		internal static bool IsDesignerContext(this global::Android.Views.View view)
+		{
+			if (!_isDesignerContext.HasValue)
+				SetDesignerContext(view);
 
 			return _isDesignerContext.Value;
 		}