Update 10.0 Preview 4 Release notes

release-notes/10.0/preview/preview4/winforms.md

@@ -2,13 +2,76 @@
 
 Here's a summary of what's new in Windows Forms in this preview release:
 
-- [Feature](#feature)
+- [Features and Enhancements](#features-and-enhancements)
+- [Bug Fixes](#bug-fixes)
+- [Infrastructure and Tooling](#infrastructure-and-tooling)
+- [Localization and Documentation](#localization-and-documentation)
 
 ## Windows Forms updates in .NET 10
 
 - [What's new in Windows Forms in .NET 10](https://learn.microsoft.com/dotnet/desktop/winforms/whats-new/net100) documentation.
-- [Issues List for Windows Forms in .NET 10 Preview 2](https://github.com/dotnet/winforms/issues?q=is%3Aissue%20milestone%3A%2210.0%20Preview2%22%20)
+- [Issues List for Windows Forms in .NET 10 Preview 4](https://github.com/dotnet/winforms/issues?q=is%3Aclosed+milestone%3A%2210.0+Preview4%22)
 
-## Feature
+---
 
-Something about the feature
+## Features and Enhancements
+
+- **Improved Test Coverage**  
+  Numerous unit tests were added to improve reliability and ensure comprehensive coverage across components.  
+  Example: [Add Unit Test For issue 13305](https://github.com/dotnet/winforms/pull/13343).
+
+- **Localization Testing**  
+  Enabled localization tests for translated resources, ensuring better support for international users.  
+  Example: [Enable localization testing since all resources are translated](https://github.com/dotnet/winforms/pull/13162).
+
+- **Shared Core Clipboard Functionality with WPF**  
+  Introduced shared functionality with WPF by moving reusable code into a common library for better interoperability.  
+  Example: [Share System.Private.Windows.Core with WPF](https://github.com/dotnet/winforms/issues/12179).
+
+---
+
+## Bug Fixes
+
+- **Improved ToolStrip Designer Support**  
+  Fixed missing "Type Here" placeholders in MenuStrip controls for a better design-time experience.  
+  Example: [Missed the "Type Here" item for the MenuStrip control](https://github.com/dotnet/winforms/issues/13077).
+
+- **DataGridView Dialog Exception Fix**  
+  Addressed a regression causing exceptions when closing dialogs with focus on DataGridView.  
+  Example: [Add _isReleasingDataSource to prevent unnecessary operations on CurrentCell](https://github.com/dotnet/winforms/pull/13320).
+
+- **Resolved SnapLine Issues**  
+  Fixed baseline SnapLines not appearing correctly in the design surface.  
+  Example: [Fix #13305 - Baseline SnapLines do not appear in DesignSurface](https://github.com/dotnet/winforms/pull/13324).
+
+---
+
+## Infrastructure and Tooling
+
+- **Enhanced GitHub Workflow Automation**  
+  Onboarded to a new issue-labeling system based on GitHub workflows to improve automation and self-service capabilities.  
+  Example: [Onboard to the GitHub workflow-based issue-labeler](https://github.com/dotnet/winforms/pull/13101).
+
+- **Native Test Adjustments**  
+  Updated test projects to conditionally exclude native tests in virtualized environments, improving CI reliability.  
+  Example: [Condition out the native tests in VMR](https://github.com/dotnet/winforms/pull/13187).
+
+---
+
+## Localization and Documentation
+
+- **Translation Updates**  
+  Reviewed and corrected translations, including fixing the French translation of "(none)."  
+  Example: [Correct translation for "(none)" in French](https://github.com/dotnet/winforms/pull/13162).
+
+- **Diagnostics Documentation Updates**  
+  Updated lists of diagnostics to clarify changes and enhancements from previous versions.  
+  Example: [Update list-of-diagnostics.md](https://github.com/dotnet/winforms/pull/13185).
+
+- **Automated Localization Check-ins**  
+  Integrated localized files from translation pipelines to ensure up-to-date multilingual support.  
+  Example: [Localized file check-in by OneLocBuild Task](https://github.com/dotnet/winforms/pull/13176).
+
+---
+
+For the full list of updates, visit the [10.0 Preview 4 milestone](https://github.com/dotnet/winforms/issues?q=is%3Aclosed+milestone%3A%2210.0+Preview4%22).