DragDropEffects display incorrectly

[Liv-Goh]

.NET version

.NET 9.0 SDK build: 9.0-rc 1.24407.28

Did it work in .NET Framework?

Not tested/verified

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

Yes, this is a regression issue. Not reproduce on .NET 8.0

Issue description

The DrapDropEffects can be observe from the cursor icon. When drag the control from the label to the listBox it display incorrectly in .NET 9.0.

Current Behavior (.NET 9.0)

Expected Behavior (.NET 8.0)

Steps to reproduce

1. Create a WinForms .NET Core project
2. Add a label and listBox to the form
3. Set the allowDrop property for both control to True
4. Link the events for the controls as below

private void label1_MouseDown(object sender, MouseEventArgs e)
{
    label1.DoDragDrop(label1.Text, DragDropEffects.Copy | DragDropEffects.Move);
}

private void listBox1_DragEnter(object sender, DragEventArgs e)
{
    e.Effect = DragDropEffects.Copy;
}

private void listBox1_DragDrop(object sender, DragEventArgs e)
{
    listBox1.Items.Add(e.Data.GetData(DataFormats.Text).ToString());                
}

5. Build and run the project
6. Try to drag the label to the listBox and observe the change of cursor icon

[lonitra]

@Olina-Zhang #11853 will fix this in main. This regressed back in Preview 1. Could your team do some additional testing around drag/drop for anything else we may have regressed?

[elachlan]

@willibrandon might be interested in the drag drop regression.

[Syareel-Sukeri]

Verified this issue on 9.0.100-rc.1.24415.1 + private dlls built from dotnet/winforms release/9.0 branch repo, DragDropEffects cursor icon is fixed.

DragDrop.mp4

[IrinaPykhova]

For the record, I have exactly the same issue with my WinForms controls. Will wait for RC1 to verify

[Philip-Wang01]

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.