move room publish toggle below canonical alias

also to own component to not contaminate alias settings too much
with this

src/components/views/room_settings/RoomPublishSetting.js

@@ -0,0 +1,60 @@
+/*
+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.
+*/
+
+import React from 'react';
+import LabelledToggleSwitch from "../elements/LabelledToggleSwitch";
+import {_t} from "../../../languageHandler";
+import {MatrixClientPeg} from "../../../MatrixClientPeg";
+
+export default class RoomPublishSetting extends React.PureComponent {
+    constructor(props) {
+        super(props);
+        this.state = {isRoomPublished: false};
+    }
+
+    onRoomPublishChange = (e) => {
+        const valueBefore = this.state.isRoomPublished;
+        const newValue = !valueBefore;
+        this.setState({isRoomPublished: newValue});
+        const client = MatrixClientPeg.get();
+
+        client.setRoomDirectoryVisibility(
+            this.props.roomId,
+            newValue ? 'public' : 'private',
+        ).catch(() => {
+            // Roll back the local echo on the change
+            this.setState({isRoomPublished: valueBefore});
+        });
+    };
+
+    componentDidMount() {
+        const client = MatrixClientPeg.get();
+        client.getRoomDirectoryVisibility(this.props.roomId).then((result => {
+            this.setState({isRoomPublished: result.visibility === 'public'});
+        }));
+    }
+
+    render() {
+        const client = MatrixClientPeg.get();
+
+        return (<LabelledToggleSwitch value={this.state.isRoomPublished}
+            onChange={this.onRoomPublishChange}
+            disabled={!this.props.canSetCanonicalAlias}
+            label={_t("Publish this room to the public in %(domain)s's room directory?", {
+              domain: client.getDomain(),
+            })} />);
+    }
+}