DiffUtils | Simple diff tool , that will generates diff

I'm trying to use Paging 3 library to get Flow> from Room, then check if item was selected or not in the recyclerview so I'm mapping this class to another class called ScanMapper. For achieving this mapping, whenever user marked an item as selected, I updated Map inside a MutableStateFlow>. Here the Map looks up an Index(Int) to get the State, State is just an enum class to represent State UNINITIALISED, USELECTED and SELECTED.

I am setting the value of the Map to a StateFlow>. The problem is, I am trying to combine the Flow> with the StateFlow> in order to also pass the State as a parameter to the ScanMapper class since this State is taken from the StateFlow> and is not a part of the original Scan class. But the PagingDataAdapter seems to always get the State UNINITIALISED despite when I'm marking item as selected on item click using the markSelected(scanId: Int) function.

Kindly tell me what I am missing here.

UPDATE

I was able to achieve the functionality that i wanted by using a Flow> and removing the usage of Paging 3 library using a recycler adapter with DiffUtils. Though this is not the actual solution since it eliminated the pagination using paging 3 library, but the following changes allowed me to perform item selection:

Updated Dao

I'm currently learning Kotlin through the Kotlin Android Developer program from Udacity. There's two sample apps using DiffUtil.ItemCallback, but declare it in different ways. Both sample apps use a ListAdapter, however one declares the DiffUtil like this: companion object DiffCallback : DiffUtil.ItemCallback()

while the other like this: class SleepNightDiffCallback: DiffUtil.ItemCallback()

Both DiffUtils are passed as parameters to the ListAdapter, with the only difference being that in the case of the class implementation, it has to be initialised:

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