Unread line: follow unread counter color

Change-Id: Ia3cd51364517276cfc438fe0f7700d11de7ff00a

vector/src/main/java/im/vector/app/features/home/room/list/RoomSummaryItem.kt

@@ -78,6 +78,15 @@ abstract class RoomSummaryItem : VectorEpoxyModel<RoomSummaryItem.Holder>() {
         holder.lastEventView.text = lastFormattedEvent.charSequence
         holder.unreadCounterBadgeView.render(UnreadCounterBadgeView.State(unreadNotificationCount, showHighlighted, unreadCount ?: 0, markedUnread))
         holder.unreadIndentIndicator.isVisible = hasUnreadMessage
+        // Mirror unreadCounterBadgeView colors
+        holder.unreadIndentIndicator.setBackgroundColor(
+                when {
+                    showHighlighted                             -> ThemeUtils.getColor(holder.unreadIndentIndicator.context, R.attr.colorError)
+                    unreadNotificationCount > 0 || markedUnread -> ThemeUtils.getColor(holder.unreadIndentIndicator.context, R.attr.colorAccent)
+                    hasUnreadMessage                            -> ThemeUtils.getColor(holder.unreadIndentIndicator.context, R.attr.vctr_content_tertiary) // same color as unread counter bg would be hard to spot
+                    else                                        -> 0
+                }
+        )
         holder.draftView.isVisible = hasDraft
         avatarRenderer.render(matrixItem, holder.avatarImageView)
         holder.roomAvatarDecorationImageView.render(encryptionTrustLevel)

vector/src/main/res/layout/item_room.xml

@@ -15,7 +15,7 @@
         android:id="@+id/roomUnreadIndicator"
         android:layout_width="4dp"
         android:layout_height="0dp"
-        android:background="?vctr_content_secondary"
+        tools:background="?colorAccent"
         android:visibility="gone"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintStart_toStartOf="parent"