more tweaking to server consent flow and changing servers on preview

src/utils/unique.js

@@ -0,0 +1,25 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+export function orderedUnique(array) {
+    const copy = [];
+    for (let i = 0; i < array.length; ++i) {
+        if (i === 0 || array.lastIndexOf(array[i], i - 1) === -1) {
+            copy.push(array[i]);
+        }
+    }
+    return copy;
+}