Hopefully you are not tracking my direct messages. Can’t judge due to licensing ;).
For the Views of comments and posts you explicitly bound the former@latter.part to its own onClickListener. You didn’t implemented that within anything in our inbox. Therefore I ask you to bind the nested RecyclerView when opening a inbox message - as well as its message itself - to the same interactions.
Sincerly, a happy user.
I’m going to change it so that long tapping the header, expand button or the side will expand actions as well.