Improve docs of PerDisplayRepository

 * Provides an instance of a given class **only** for the default display, even if asked for another

 * display.

 *

 * This is useful in case of flag refactors: it can be provided instead of an instance of

 * This is useful in case of **flag refactors**: it can be provided instead of an instance of

 * [PerDisplayInstanceRepositoryImpl] when a flag related to multi display refactoring is off.

 *

 * Note that this still requires all instances to be provided by a [PerDisplayInstanceProvider]. If

 * you want to provide an existing instance instead for the default display, either implement it in

 * a custom [PerDisplayInstanceProvider] (e.g. inject it in the constructor and return it if the

 * displayId is zero), or use [SingleInstanceRepositoryImpl].

 */

class DefaultDisplayOnlyInstanceRepositoryImpl<T>(

    override val debugName: String,

}

/**

 * Always returns only one instance.

 * Always returns [instance] for any display.

 *

 * This can be used to provide a single instance based on a flag value during a refactor. Similar to

 * [DefaultDisplayOnlyInstanceRepositoryImpl], but also avoids creating the

 * [PerDisplayInstanceProvider].

 * [PerDisplayInstanceProvider]. This is useful when you want to provide an existing instance only,

 * without even instantiating a [PerDisplayInstanceProvider].

 */

class SingleInstanceRepositoryImpl<T>(override val debugName: String, private val instance: T) :

    PerDisplayRepository<T> {