Before this commit, the loader removed messages _after_ it updated the
list. Coincidentally the list updating mechanism is asynchronous to
some extent and so slower devices might've had the message removed
after changes have been dispatched which confused the recyclerview and
caused the crash.
Now, the loader is stripped of the responsibility update the list
holding helper messages. The responsibility is for the user itself to
notify listeners and then clear the helper list. This should hopefully
delay the removal to the point where choreographer had enough time to
traverse through the hierarchy.
Stupid recycler view / layout managers. Literally unnecessary crash.
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