Squashed commit of the following:

commit 1d23724
Author: Marcel Wagner <[email protected]>
Date:   Wed Oct 11 02:31:01 2023 +0200

    Cleanup unnecessary code (microsoft#1299)

commit 20cd457
Author: Scott Jones <[email protected]>
Date:   Tue Oct 10 17:30:05 2023 -0700

    Update to WinAppSDK 1.4.2 and remove temporary workaround for including version info without dupe warnings (microsoft#1379)

commit c2fd30d
Author: Scott Jones <[email protected]>
Date:   Tue Oct 10 10:47:39 2023 -0700

    Set TrimMode explicitly back to partial for .NET 7 compat (microsoft#1378)

    See:

    https://learn.microsoft.com/en-us/dotnet/core/deploying/trimming/trimming-options?pivots=dotnet-7-0

commit f72609f
Author: Pratik Anand <[email protected]>
Date:   Tue Oct 3 12:29:10 2023 -0700

    Clickable Interactive control sample for custom titlebar (microsoft#1360)

    With 1.4 changes, WinUI 3 custom titlebar now uses appwindow titlebar + nonclientinputpointersource apis under the hood. This opens up new possibilities like allowing clickable interactive controls like textbox, button in the titlebar area, surrounded by draggable region on both left and the right sides.

    This code adds a sample to titlebar page which shows users how to create interactive controls in winui 3 titlebar. It also demonstrates the power of mixing and matching high level winui 3 custom titlebar apis and low level nonclient apis.

commit 5a96afc
Author: Andrew KeepCoding <[email protected]>
Date:   Thu Sep 28 19:31:59 2023 +0900

    Fix issue that crashes the app when navigating to SemanticZoomPage (microsoft#1363)

commit 9650e4e
Author: Marcel Wagner <[email protected]>
Date:   Thu Sep 28 12:31:39 2023 +0200

    Switch .NET 7 (microsoft#1115)

commit 8f1b425
Author: Marcel Wagner <[email protected]>
Date:   Thu Sep 28 12:31:22 2023 +0200

    First round of UWP link replacement (microsoft#1347)

    Co-authored-by: Bob Pulliam <[email protected]>

WinUIGallery/ControlPages/TitleBarPage.xaml.cs

@@ -58,8 +58,6 @@ protected override void OnNavigatedFrom(NavigationEventArgs e)
         private void SetTitleBar(UIElement titlebar, bool forceCustomTitlebar = false)
         {
             var window = WindowHelper.GetWindowForElement(this as UIElement);
-            var titleBarElement = UIHelper.FindElementByName(this, "AppTitleBar");
-
             if (!window.ExtendsContentIntoTitleBar)
             {
                 titleBarElement.Visibility = Visibility.Visible;