Refactor code for displaying SIM index in message list

        // Bind the timestamp

        val timeSincePrevious = TimeUnit.MILLISECONDS.toMinutes(message.date - (previous?.date ?: 0))

        val simIndex = subs.takeIf { it.size > 1 }?.indexOfFirst { it.subscriptionId == message.subId } ?: -1

        val subscription = subs.find { sub -> sub.subscriptionId == message.subId }

        holder.timestamp.text = dateFormatter.getMessageTimestamp(message.date)

        if (simIndex != -1){

            holder.simIndex.text = "${subs[simIndex].simSlotIndex + 1} - " + subs[simIndex].displayName

        } else {

            holder.simIndex.text = "${simIndex + 1}"

        }

        holder.simIndex.text = subscription?.let { sub -> sub.simSlotIndex + 1 }?.toString()

        holder.timestamp.setVisible(timeSincePrevious >= BubbleUtils.TIMESTAMP_THRESHOLD

                || message.subId != previous?.subId && simIndex != -1)

        holder.sim.setVisible(message.subId != previous?.subId && simIndex != -1)

        holder.simIndex.setVisible(message.subId != previous?.subId && simIndex != -1)

                || message.subId != previous?.subId && subscription != null)

        holder.sim.setVisible(message.subId != previous?.subId && subscription != null)

        holder.simIndex.setVisible(message.subId != previous?.subId && subscription != null)

        // Bind the grouping

        val media = message.parts.filter { !it.isSmil() && !it.isText() }