[DarkMode] Dark Mode breaks Visual Basic App Framework enabled classic VisualStyles

[KlausLoeffelmann]

.NET version

Visual Styles cannot be enabled any longer in .NET 9.

Did it work in .NET Framework?

Yes

Did it work in any of the earlier releases of .NET Core or .NET 5+?

Yes, in all of them.

Issue description

By default, (classic) Visual Styles are enabled in the Visual Basic Application Framework. This is also reflected by the Application Framework Project System Property Pages. Enabling or Disabling Visual Styles has no impact for Visual Basic Application Framework Apps.

Steps to reproduce

• Create a new .NET 9 VB App Framework WinForms App.
• Alternatively, load an existing VB App.
• Make sure in the Project Property Pages, that Visual Styles are activated.
• Confirm, in Application.MyApp that the settings from the UI got applied and the correct code got code-generated.
• Run the App.

[Syareel-Sukeri]

Verified this issue in the latest .NET 9 RC1 build: 9.0.100-rc.1.24421.9 from https://aka.ms/dotnet/9.0.1xx-rc1/daily/dotnet-sdk-win-x64.exe, it was fixed:

[MandiMan]

Verified this issue in the latest .NET9.0 SDK build: 9.0.100-rc.2.24420.21 + dlls built from Winforms main branch, it was fixed:

[Nora-Zhou01]

Verified the issue with .NET 9.0.100-rc.1.24422.10 test pass build that the issue has been fixed, which have the same results as above.

[MelonWang1]

Verified this issue in the latest .NET9.0 SDK build: 9.0.100-rc.2.24428.6, it was fixed. Same test result as above.

[Nora-Zhou01]

Verified the issue with .NET 9.0.100-rc.2.24474.11 test pass build that the issue has been fixed, which have the same results as above.