This change:

- Make  `DocumentSelector` use a readonly array
- Updates all properties of `DocumentFilter` to be readonly

`DocumentSelector` is used as a parameter in our provider APIs and does not need to be mutable. This change lets extensions pass in readonly values for the selector

and don't create one if there are other tabs already

As it seems the desired behaviour is to just iterate through all elements, then consider using forEach or a for-of loop instead.

when capping decoration events pick somewhat smarter, https://github.com/microsoft/vscode/issues/108292

Add new property to IConfigurationPropertySchema

#109219

fixes #107830

#107830

disable explain mode when suggest widget hides, fixes https://github.com/microsoft/vscode/issues/80983

fixes #107921

Fixes #106095 and #107277