[UWP] Images - when the uwp app suspends and resumes again the image source should be reupdated as uwp replaces images with transparent images onResume (#10161) fixes #8783 fixes #9249 fixes #10168

* #8783 - uwp - images - when the uwp app suspends and resumes again the image source should be reupdated as uwp replaces images with transparent images onResume

* #8783 - uwp - OnResume - The toolbar items and their images should be visible after resuming the uwp app

Xamarin.Forms.Platform.UAP/ImageRenderer.cs

@@ -14,6 +14,7 @@ namespace Xamarin.Forms.Platform.UWP
 		public ImageRenderer() : base()
 		{
 			ImageElementManager.Init(this);
+			Windows.UI.Xaml.Application.Current.Resuming += OnResumingAsync;
 		}
 
 		bool IImageVisualElementRenderer.IsDisposed => _disposed;
@@ -44,6 +45,7 @@ namespace Xamarin.Forms.Platform.UWP
 				{
 					Control.ImageOpened -= OnImageOpened;
 					Control.ImageFailed -= OnImageFailed;
+					Windows.UI.Xaml.Application.Current.Resuming -= OnResumingAsync;
 				}
 			}
 
@@ -119,6 +121,20 @@ namespace Xamarin.Forms.Platform.UWP
 			await ImageElementManager.UpdateSource(this).ConfigureAwait(false);
 		}
 
+		async void OnResumingAsync(object sender, object e)
+		{
+			try
+			{
+				await ImageElementManager.UpdateSource(this);
+			}
+			catch (Exception exception)
+			{
+				Log.Warning("Update image source after app resume", 
+					$"ImageSource failed to update after app resume: {exception.Message}");
+				
+			}
+		}
+
 		void IImageVisualElementRenderer.SetImage(Windows.UI.Xaml.Media.ImageSource image)
 		{
 			Control.Source = image;

Xamarin.Forms.Platform.UAP/Platform.cs

@@ -103,6 +103,21 @@ namespace Xamarin.Forms.Platform.UWP
 			InitializeStatusBar();
 
 			SystemNavigationManager.GetForCurrentView().BackRequested += OnBackRequested;
+			Windows.UI.Xaml.Application.Current.Resuming += OnResumingAsync;
+		}
+
+		async void OnResumingAsync(object sender, object e)
+		{
+			try
+			{
+				await UpdateToolbarItems();
+			}
+			catch (Exception exception)
+			{
+				Log.Warning("Update toolbar items after app resume", 
+					$"UpdateToolbarItems failed after app resume: {exception.Message}");
+
+			}
 		}
 
 		internal void SetPage(Page newRoot)