onItemRemoved method
Called when a conversation is removed from the list.
Implementation
@override
void onItemRemoved(Conversation item, List<Conversation> updatedList) {
// Get the index BEFORE removing from map (map still has old index)
final removedIndex = _conversationIndexMap[item.conversationId];
// Remove from map
_removeFromIndexMap(item.conversationId);
// Shift indices for items that were after the removed item
if (removedIndex != null) {
_shiftIndicesAfterRemoval(removedIndex);
}
if (!isClosed) {
add(_ListItemRemoved(updatedList));
}
}