<How to observe changes in a List when the ViewMod...

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How to observe changes in a List when the ViewModel is in Java and the UI is in Jetpack Compose (Kotlin)
I am migrating an application from View to Compose. The application was written in Java so I need to migrate the UI to Kotlin.
I prefer to it as gradually as possible to I'm leaving the ViewModel in Java.
The UI is a lazy column of Cards. A long click on a card toggles its selected state. It sends an event to the ViewModel - adding/deleting its ID to/from a List that contains the IDs of the selected cards.
I would like the UI to observe the changes in the List of IDs.
Currently, I use a...