Merged main into live

Author: QuinnRadich

hub/apps/windows-app-sdk/downloads.md

@@ -22,6 +22,7 @@ For all the latest Windows App SDK downloads, refer to the tables and links belo
 
 | Version | Runtime downloads |
 |---|---|
+| [1.6.6 (1.6.250228001)](stable-channel.md#version-166-16250228001) <br/> 03/11/2025 <br/> [Release notes](stable-channel.md#version-166-16250228001) <br/> [Source](https://github.com/microsoft/microsoft-ui-xaml/releases/tag/winui3%2Frelease%2F1.6.6) | [Installer (x64)](https://aka.ms/windowsappsdk/1.6/1.6.250228001/windowsappruntimeinstall-x64.exe) <br/> [Installer (x86)](https://aka.ms/windowsappsdk/1.6/1.6.250228001/windowsappruntimeinstall-x86.exe) <br/> [Installer (arm64)](https://aka.ms/windowsappsdk/1.6/1.6.250228001/windowsappruntimeinstall-arm64.exe) <br/> [Redistributable](https://aka.ms/windowsappsdk/1.6/1.6.250228001/Microsoft.WindowsAppRuntime.Redist.1.6.zip) |
 | [1.6.5 (1.6.250205002)](stable-channel.md#version-165-16250205002) <br/> 02/11/2025 <br/> [Release notes](stable-channel.md#version-165-16250205002) <br/> [Source](https://github.com/microsoft/microsoft-ui-xaml/releases/tag/winui3%2Frelease%2F1.6.5) | [Installer (x64)](https://aka.ms/windowsappsdk/1.6/1.6.250205002/windowsappruntimeinstall-x64.exe) <br/> [Installer (x86)](https://aka.ms/windowsappsdk/1.6/1.6.250205002/windowsappruntimeinstall-x86.exe) <br/> [Installer (arm64)](https://aka.ms/windowsappsdk/1.6/1.6.250205002/windowsappruntimeinstall-arm64.exe) <br/> [Redistributable](https://aka.ms/windowsappsdk/1.6/1.6.250205002/Microsoft.WindowsAppRuntime.Redist.1.6.zip) |
 | [1.6.4 (1.6.250108002)](stable-channel.md#version-164-16250108002) <br/> 01/15/2025 <br/> [Release notes](stable-channel.md#version-164-16250108002) <br/> [Source](https://github.com/microsoft/microsoft-ui-xaml/releases/tag/winui3%2Frelease%2F1.6.4) | [Installer (x64)](https://aka.ms/windowsappsdk/1.6/1.6.250108002/windowsappruntimeinstall-x64.exe) <br/> [Installer (x86)](https://aka.ms/windowsappsdk/1.6/1.6.250108002/windowsappruntimeinstall-x86.exe) <br/> [Installer (arm64)](https://aka.ms/windowsappsdk/1.6/1.6.250108002/windowsappruntimeinstall-arm64.exe) <br/> [Redistributable](https://aka.ms/windowsappsdk/1.6/1.6.250108002/Microsoft.WindowsAppRuntime.Redist.1.6.zip) |
 | [1.6.3 (1.6.241114003)](stable-channel.md#version-163-16241114003) <br/> 11/18/2024 <br/> [Release notes](stable-channel.md#version-163-16241114003) <br/> [Source](https://github.com/microsoft/microsoft-ui-xaml/releases/tag/winui3%2Frelease%2F1.6.3) | [Installer (x64)](https://aka.ms/windowsappsdk/1.6/1.6.241114003/windowsappruntimeinstall-x64.exe) <br/> [Installer (x86)](https://aka.ms/windowsappsdk/1.6/1.6.241114003/windowsappruntimeinstall-x86.exe) <br/> [Installer (arm64)](https://aka.ms/windowsappsdk/1.6/1.6.241114003/windowsappruntimeinstall-arm64.exe) <br/> [Redistributable](https://aka.ms/windowsappsdk/1.6/1.6.241114003/Microsoft.WindowsAppRuntime.Redist.1.6.zip) |

hub/apps/windows-app-sdk/release-channels.md

@@ -17,7 +17,7 @@ The latest version of the Windows App SDK ships via three release channels: Expe
 |         | Channel                                                 | Description                                                                                                                                                                | Release cadence                                                                    | Supported? | Latest release                                                                                      |
 |---------|---------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------|------------|-----------------------------------------------------------------------------------------------------|
 | **❇️**  | Preview ([release notes](preview-channel.md))           | This channel provides a preview of the next stable release. There may be breaking API changes between a given preview channel release and the next stable release.         | At least one preview per stable version                                           | No         | [1.7.0-preview1](preview-channel.md#version-17-preview-1-17-preview1) (02/11/2025)                 |
-| **✅**   | Stable ([release notes](stable-channel.md))             | This channel is supported for use by apps in production environments. It includes only stable APIs.                                                                        | No more frequent than every six months<br>(+ servicing)                                   | Yes        | [1.6.5 (1.6.250205002)](stable-channel.md#version-165-16250205002) (02/11/2025)                                                 |
+| **✅**   | Stable ([release notes](stable-channel.md))             | This channel is supported for use by apps in production environments. It includes only stable APIs.                                                                        | No more frequent than every six months<br>(+ servicing)                                   | Yes        | [1.6.6 (1.6.250228001)](stable-channel.md#version-166-16250228001) (03/11/2025)                                                 |
 | **🔄️** | Experimental ([release notes](experimental-channel.md)) | This channel includes experimental features that are in early stages of development. Experimental features may be removed from the next release, or may never be released. | As needed when requiring feedback for features in early design or prototype stages | No         | [1.7.0-experimental3](experimental-channel.md#version-17-experimental-170-experimental3) (02/06/2025) |
 
 For a comprehensive list of all current and previous releases of the Windows App SDK, including download locations, see [Downloads for the Windows App SDK](downloads.md).

hub/apps/windows-app-sdk/stable-channel.md

@@ -31,6 +31,30 @@ The stable channel provides releases of the Windows App SDK that are supported f
 > [!NOTE]
 > The Windows App SDK Visual Studio Extensions (VSIX) are no longer distributed as a separate download. They are available in the Visual Studio Marketplace inside Visual Studio.
 
+### Version 1.6.6 (1.6.250228001)
+
+This is a servicing release of the Windows App SDK that includes critical bug fixes for the 1.6 release.
+
+- Fixed an issue where a child window posting WM_NCMOUSELEAVE to the parent window would result in a loop that blocks new mouse input events.
+- Fixed a crash which would occur on the next AppWindow.Changed event after a WebView2 process failure.
+- Fixed a potential crash when using an Accessibility tool and closing a window.
+- Fixed an issue where a textbox would not accept key input if given focus by clicking in the area of the clear button of the textbox. For more info, see GitHub issue [#7703](https://github.com/microsoft/microsoft-ui-xaml/issues/7703).
+- Fixed an issue where a tooltip is not shown for the Minimize button in the titlebar when using `ExtendsContentIntoTitleBar=true`. For more info, see GitHub issue [#9149](https://github.com/microsoft/microsoft-ui-xaml/issues/9149).
+
+This release includes the following new APIs: 
+
+A new `IsPlaceholderContent` property on `WidgetInfo` and `WidgetUpdateRequestOptions` enables a Widget provider to indicate that it would display placeholder content if rendered. For example, a Widget that shows weather information should set IsPlaceholderContent to true if the user has not yet specified a weather location and the Widget is merely showing weather information for a default location like Seattle. When a Widget is marked as placeholder, certain hosts may decide to hide the Widget or prioritize other Widgets.
+
+```
+Microsoft.Windows.Widgets.Providers
+
+    WidgetInfo
+        IsPlaceholderContent
+
+    WidgetUpdateRequestOptions
+        IsPlaceholderContent
+```
+
 ### Version 1.6.5 (1.6.250205002)
 
 This is a servicing release of the Windows App SDK that includes critical bug fixes for the 1.6 release.