Code Quality: Avoid redundant OnPropertyChanged calls in ContentPageContext (#14114)

Author: hishitetsu

src/Files.App/Data/Contexts/ContentPage/ContentPageContext.cs

@@ -107,6 +107,7 @@ private void Context_Changed(object? sender, EventArgs e)
 
 			Update();
 			OnPropertyChanged(nameof(ShellPage));
+			OnPropertyChanged(nameof(Folder));
 		}
 
 		private void Page_PropertyChanged(object? sender, PropertyChangedEventArgs e)
@@ -196,7 +197,6 @@ private void Update()
 			UpdatePageType();
 			UpdateSelectedItems();
 
-			OnPropertyChanged(nameof(Folder));
 			OnPropertyChanged(nameof(HasItem));
 			OnPropertyChanged(nameof(CanGoBack));
 			OnPropertyChanged(nameof(CanGoForward));

src/Files.App/Data/Contexts/Page/PageContext.cs

@@ -75,6 +75,9 @@ private void UpdatePage(PaneHolderPage? newPage)
 
 		private void UpdateContent()
 		{
+			if (pane == page?.ActivePane && paneOrColumn == page?.ActivePaneOrColumn)
+				return;
+
 			Changing?.Invoke(this, EventArgs.Empty);
 
 			pane = page?.ActivePane;

src/Files.App/Views/MainPage.xaml.cs

@@ -461,6 +461,9 @@ private void LoadPaneChanged()
 		private void OnPropertyChanged([CallerMemberName] string propertyName = "")
 		{
 			PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+
+			if (propertyName == nameof(ShouldPreviewPaneBeActive) && ShouldPreviewPaneBeActive)
+				_ = Ioc.Default.GetRequiredService<InfoPaneViewModel>().UpdateSelectedItemPreviewAsync();
 		}
 
 		private void RootGrid_PreviewKeyDown(object sender, KeyRoutedEventArgs e)