StatusStrip breaking change (#44043)

* StatusStrip breaking change

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docs/core/compatibility/9.0.md

@@ -2,7 +2,7 @@
 title: Breaking changes in .NET 9
 titleSuffix: ""
 description: Navigate to the breaking changes in .NET 9.
-ms.date: 08/05/2024
+ms.date: 12/19/2024
 no-loc: [Blazor, Razor, Kestrel]
 ---
 # Breaking changes in .NET 9
@@ -117,16 +117,17 @@ If you're migrating an app to .NET 9, the breaking changes listed here might aff
 
 ## Windows Forms
 
-| Title                                                                                   | Type of change      | Introduced version |
-|-----------------------------------------------------------------------------------------|---------------------|--------------------|
-| [BindingSource.SortDescriptions doesn't return null](windows-forms/9.0/sortdescriptions-return-value.md) | Behavioral change | Preview 1 |
-| [Changes to nullability annotations](windows-forms/9.0/nullability-changes.md)          | Source incompatible | Preview 1          |
-| [ComponentDesigner.Initialize throws ArgumentNullException](windows-forms/9.0/componentdesigner-initialize.md) | Behavioral change | Preview 1          |
-| [DataGridViewRowAccessibleObject.Name starting row index](windows-forms/9.0/datagridviewrowaccessibleobject-name-row.md) | Behavioral change | Preview 1 |
-| [IMsoComponent support is opt-in](windows-forms/9.0/imsocomponent-support.md)           | Behavioral change   | Preview 2          |
-| [New security analyzers](windows-forms/9.0/security-analyzers.md)                       | Source incompatible | RC 1               |
-| [No exception if DataGridView is null](windows-forms/9.0/datagridviewheadercell-nre.md) | Behavioral change   | Preview 1          |
-| [PictureBox raises HttpClient exceptions](windows-forms/9.0/httpclient-exceptions.md)   | Behavioral change   | Preview 6          |
+| Title                                                                                                                    | Type of change      | Introduced version |
+|--------------------------------------------------------------------------------------------------------------------------|---------------------|--------------------|
+| [BindingSource.SortDescriptions doesn't return null](windows-forms/9.0/sortdescriptions-return-value.md)                 | Behavioral change   | Preview 1          |
+| [Changes to nullability annotations](windows-forms/9.0/nullability-changes.md)                                           | Source incompatible | Preview 1          |
+| [ComponentDesigner.Initialize throws ArgumentNullException](windows-forms/9.0/componentdesigner-initialize.md)           | Behavioral change   | Preview 1          |
+| [DataGridViewRowAccessibleObject.Name starting row index](windows-forms/9.0/datagridviewrowaccessibleobject-name-row.md) | Behavioral change   | Preview 1          |
+| [IMsoComponent support is opt-in](windows-forms/9.0/imsocomponent-support.md)                                            | Behavioral change   | Preview 2          |
+| [New security analyzers](windows-forms/9.0/security-analyzers.md)                                                        | Source incompatible | RC 1               |
+| [No exception if DataGridView is null](windows-forms/9.0/datagridviewheadercell-nre.md)                                  | Behavioral change   | Preview 1          |
+| [PictureBox raises HttpClient exceptions](windows-forms/9.0/httpclient-exceptions.md)                                    | Behavioral change   | Preview 6          |
+| [StatusStrip uses a different default renderer](windows-forms/9.0/statusstrip-renderer.md)                               | Behavioral change   | GA                 |
 
 ## WPF
 

docs/core/compatibility/toc.yml

@@ -142,6 +142,8 @@ items:
                 href: windows-forms/9.0/datagridviewheadercell-nre.md
               - name: PictureBox raises HttpClient exceptions
                 href: windows-forms/9.0/httpclient-exceptions.md
+              - name: StatusStrip uses different default renderer
+                href: windows-forms/9.0/statusstrip-renderer.md
           - name: WPF
             items:
               - name: "'GetXmlNamespaceMaps' type change"
@@ -2040,6 +2042,7 @@ items:
                 href: windows-forms/9.0/datagridviewheadercell-nre.md
               - name: PictureBox raises HttpClient exceptions
                 href: windows-forms/9.0/httpclient-exceptions.md
+              - name: StatusStrip uses different default renderer
           - name: .NET 8
             items:
               - name: Anchor layout changes

docs/core/compatibility/windows-forms/9.0/statusstrip-renderer.md

@@ -0,0 +1,37 @@
+---
+title: "Breaking change: System.Windows.Forms.StatusStrip uses a different default renderer"
+description: Learn about the breaking change in .NET 9 for Windows Forms where System.Windows.Forms.StatusStrip uses a different default value for the RenderMode property.
+ms.date: 12/19/2024
+---
+# System.Windows.Forms.StatusStrip uses a different default renderer
+
+<xref:System.Windows.Forms.StatusStrip?displayProperty=nameWithType> has been updated to use the default renderer.
+
+## Version introduced
+
+.NET 9
+
+## Previous behavior
+
+Previously, the `StatusStrip`'s `RenderMode` property was set to <xref:System.Windows.Forms.ToolStripRenderMode.System?displayProperty=nameWithType> by default.
+
+## New behavior
+
+<xref:System.Windows.Forms.StatusStrip?displayProperty=nameWithType> uses the default renderer. You might observe minor changes to the appearance of the `StatusStrip`.
+
+## Change category
+
+This change is a [*behavioral change*](../../categories.md#behavioral-change).
+
+## Reason for change
+
+The previous default behavior didn't meet accessibility standards. The focus indicator over the `ToolStripSplitButton` was difficult to see due to the lack of contrast.
+
+## Recommended action
+
+The new behavior is recommended for accessibility reasons. If you want to revert to the previous behavior, set the `RenderMode` property to <xref:System.Windows.Forms.ToolStripRenderMode.System?displayProperty=nameWithType>.
+
+## Affected APIs
+
+- <xref:System.Windows.Forms.StatusStrip?displayProperty=fullName>
+- <xref:System.Windows.Forms.ToolStripManager.RenderMode?displayProperty=fullName>