Replace MSC3244 support with in-client room version checking (#9018)

* Replace MSC3244 support with in-client room version checking

* Fix irrelevant ternary

* It helps to use Jest correctly

test/PreferredRoomVersions-test.ts

@@ -0,0 +1,46 @@
+/*
+Copyright 2022 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.
+*/
+
+import { doesRoomVersionSupport, PreferredRoomVersions } from "../src/utils/PreferredRoomVersions";
+
+describe("doesRoomVersionSupport", () => {
+    it("should detect unstable as unsupported", () => {
+        expect(doesRoomVersionSupport("org.example.unstable", "1")).toBe(false);
+        expect(doesRoomVersionSupport("1.2-beta", "1")).toBe(false);
+    });
+
+    it("should detect support properly", () => {
+        expect(doesRoomVersionSupport("1", "2")).toBe(false); // older
+        expect(doesRoomVersionSupport("2", "2")).toBe(true); // exact
+        expect(doesRoomVersionSupport("3", "2")).toBe(true); // newer
+    });
+
+    it("should handle decimal versions", () => {
+        expect(doesRoomVersionSupport("1.1", "2.2")).toBe(false); // older
+        expect(doesRoomVersionSupport("2.1", "2.2")).toBe(false); // exact-ish
+        expect(doesRoomVersionSupport("2.2", "2.2")).toBe(true); // exact
+        expect(doesRoomVersionSupport("2.3", "2.2")).toBe(true); // exact-ish
+        expect(doesRoomVersionSupport("3.1", "2.2")).toBe(true); // newer
+    });
+
+    it("should detect restricted rooms in v9 and v10", () => {
+        // Dev note: we consider it a feature that v8 rooms have to upgrade considering the bug in v8.
+        // https://spec.matrix.org/v1.3/rooms/v8/#redactions
+        expect(doesRoomVersionSupport("8", PreferredRoomVersions.RestrictedRooms)).toBe(false);
+        expect(doesRoomVersionSupport("9", PreferredRoomVersions.RestrictedRooms)).toBe(true);
+        expect(doesRoomVersionSupport("10", PreferredRoomVersions.RestrictedRooms)).toBe(true);
+    });
+});