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MediaCapture + WinUI 3 MediaPlayerElement doesn't support same subtype formats as WinUI 2 CaptureElement

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### Describe the bug As CaptureElement is not available in WinUI 3, the official workaround is to use a MediaPlayerElement instead (#4710). This works in most cases, but not all....

### Dev Home version 0.1601.561.0 ### Windows build number 10.0.26257.0 ### Other software _No response_ ### Steps to reproduce the bug - Install Dev Home - Have a system without...

### Describe the bug According to [Windows app design guidelines](https://learn.microsoft.com/en-us/windows/apps/design/basics/titlebar-design#icon), the icon in the app title bar should have the following behavior: > A single-click/tap on the icon should show...

### Describe the bug The black in-app toolbar at the top of a debugged WinUI 3 window has a feature to select an element in the XAML visual tree by...

### Describe the bug Setting SystemBackdrop on Popup (e.g. to Acrylic) has no effect, the popup stays transparent. Regardless of whether ShouldConstrainToRootBounds is set to True or False. For a...

PackageDeploymentManager.IsPackageReadyOrNewerAvailable() throws NotImplementedException even if IsPackageDeploymentFeatureSupported

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### Describe the bug `PackageDeploymentManager.IsPackageReadyOrNewerAvailable()` throws `NotImplementedException` even though `PackageDeploymentManager.IsPackageDeploymentFeatureSupported(PackageDeploymentFeature.IsPackageReadyOrNewerAvailable)` returns true. Tested on Windows 11 24H2 (26100). Note: it would be nice if on the docs page https://learn.microsoft.com/en-us/windows/windows-app-sdk/api/winrt/microsoft.windows.management.deployment.packagedeploymentmanager.ispackagereadyorneweravailable the...

### Describe the bug `PackageDeploymentManager.RegisterPackageAsync()` fails to execute while the WinRT counterpart `PackageManager.RegisterPackageByFullNameAsync()` succeeds. The WASDK method returns with`PackageDeploymentStatus.CompletedFailure`, but empty `Error/ErrorText/ExtendedError` properties. The console (with native debugging enabled) shows:...

### Description COMExceptions thrown by WinRT code often times only have an empty error message. This greatly impacts the developer experience, especially for beginners. To understand the error, the HResult...

## Summary Allow to set an owner window for a `Microsoft.UI.Xaml.Window` by providing an owner `WindowId`, analog to [`AppWindow.Create()`](https://learn.microsoft.com/en-us/windows/windows-app-sdk/api/winrt/microsoft.ui.windowing.appwindow.create?view=windows-app-sdk-1.6#microsoft-ui-windowing-appwindow-create(microsoft-ui-windowing-appwindowpresenter-microsoft-ui-windowid)) functionality. ## Rationale * Allows to create modal/dialog windows in WinUI...

Feature Request: API to detect dark mode

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To this date, there is no proper API to detect whether dark mode is enabled in Windows. The proposed API must provide: * Selected _app mode_ theme * Notifications when...