Fix tags going missing if you join communities

src/timeline/CommunitiesModel.h

@@ -37,7 +37,7 @@ public:
         int rowCount(const QModelIndex &parent = QModelIndex()) const override
         {
                 (void)parent;
-                return 1 + tags_.size();
+                return 1 + tags_.size() + spaceOrder_.size();
         }
         QVariant data(const QModelIndex &index, int role) const override;