Ready for Avalonia 12.0.x #651
Description
- IsEditable combox box AvaloniaUI/Avalonia#18094
- Add GroupBox AvaloniaUI/Avalonia#19366
- Add Scrollbar Context Menu AvaloniaUI/Avalonia#19413
- Relate shared resources using ThicknessMixer & CornerRadiusMixer #634
- Bring DataGrid and TreeDataGrid back to demo when 12.0 package is ready.