Hide rooms that have a defined room type

I have a room with a custom type that's only for holding data, and
doesn't need to be shown in the room list. Currently the spec is a bit
vague about what clients should do, but hiding them is probably fine
for now.

src/models/roomtreemodel.cpp

@@ -286,6 +286,7 @@ QHash<int, QByteArray> RoomTreeModel::roleNames() const
     roles[IconRole] = "icon";
     roles[AttentionRole] = "attention";
     roles[FavouriteRole] = "favourite";
+    roles[RoomTypeRole] = "roomType";
     return roles;
 }
 
@@ -385,6 +386,11 @@ QVariant RoomTreeModel::data(const QModelIndex &index, int role) const
     if (role == FavouriteRole) {
         return room->isFavourite();
     }
+    if (role == RoomTypeRole) {
+        if (room->creation()) {
+            return room->creation()->contentPart<QString>("type"_L1);
+        }
+    }
 
     return {};
 }

src/models/roomtreemodel.h

@@ -50,6 +50,7 @@ public:
         IconRole,
         AttentionRole, /**< Whether there are any notifications. */
         FavouriteRole, /**< Whether the room is favourited. */
+        RoomTypeRole, /**< The room's type. */
     };
     Q_ENUM(EventRoles)
     explicit RoomTreeModel(QObject *parent = nullptr);

src/models/sortfilterroomtreemodel.cpp

@@ -157,6 +157,11 @@ bool SortFilterRoomTreeModel::filterAcceptsRow(int source_row, const QModelIndex
         return false;
     }
 
+    // Hide rooms with defined types, assuming that data-holding rooms have a defined type
+    if (!sourceModel()->data(index, RoomTreeModel::RoomTypeRole).toString().isEmpty()) {
+        return false;
+    }
+
     static auto config = NeoChatConfig::self();
     if (config->allRoomsInHome() && RoomManager::instance().currentSpace().isEmpty()) {
         return acceptRoom;