Merge pull request #6939 from matrix-org/dbkr/fix_room_list_on_unsent_message

Fix bug where room list would get stuck showing no rooms

src/stores/room-list/algorithms/list-ordering/ImportanceAlgorithm.ts

@@ -37,6 +37,7 @@ interface ICategoryIndex {
 // comments! Check the usage of Category carefully to figure out what needs changing
 // if you're going to change this array's order.
 const CATEGORY_ORDER = [
+    NotificationColor.Unsent,
     NotificationColor.Red,
     NotificationColor.Grey,
     NotificationColor.Bold,
@@ -50,9 +51,10 @@ const CATEGORY_ORDER = [
  * interfere with this algorithm, however manual ordering does.
  *
  * The importance of a room is defined by the kind of notifications, if any, are
- * present on the room. These are classified internally as Red, Grey, Bold, and
- * Idle. Red rooms have mentions, grey have unread messages, bold is a less noisy
- * version of grey, and idle means all activity has been seen by the user.
+ * present on the room. These are classified internally as Unsent, Red, Grey,
+ * Bold, and Idle. 'Unsent' rooms have unsent messages, Red rooms have mentions,
+ * grey have unread messages, bold is a less noisy version of grey, and idle
+ * means all activity has been seen by the user.
  *
  * The algorithm works by monitoring all room changes, including new messages in
  * tracked rooms, to determine if it needs a new category or different placement
@@ -74,6 +76,7 @@ export class ImportanceAlgorithm extends OrderingAlgorithm {
     // noinspection JSMethodCanBeStatic
     private categorizeRooms(rooms: Room[]): ICategorizedRoomMap {
         const map: ICategorizedRoomMap = {
+            [NotificationColor.Unsent]: [],
             [NotificationColor.Red]: [],
             [NotificationColor.Grey]: [],
             [NotificationColor.Bold]: [],