CodeDomSerializationStore in not marked as Serializable

[MrB0nd]

• .NET Core Version: 3.0.100-preview9-014004
• Have you experienced this same bug with .NET Framework?: No

We faced a problem when porting our application to .NET Core 3. We have a copy/paste functionality which is implemented similar to the standard copy/paste (via IDesignerSerializationService).
On copying we get the SerializationException:
'Type System.ComponentModel.Design.Serialization.CodeDomComponentSerializationService + CodeDomSerializationStore' in Assembly 'System.Windows.Forms.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' is not marked as serializable.'

Сan we expect the attribute to appear in the next release?

[RussKie]

The serialisation was removed in #1425.

@Tanya-Solyanik the list of types that should still be serialisable includes System.ComponentModel.Design.Serialization.CodeDomComponentSerializationService.CodeDomSerializationStore (#889 (comment)) however it appears to have been marked as non serialisable:
44b5076#diff-9b75c5f1a3a9a26efe5f949b35d2b0b0L231-L232

Was this intentional or accidental?

[RussKie]

This serialization mechanism has had serious maintenance and security concerns in the past.
The Core designer will not put binary content on the clipboard, and hence the attribute was removed.

[RussKie]

Here's the list of types that are no longer serialisable in Windows Forms going forward dotnet/docs#14175
You may also find this post useful https://docs.microsoft.com/en-us/dotnet/standard/serialization/binary-serialization