Give a route for retrying invites for users which may not exist

Fixes https://github.com/vector-im/riot-web/issues/7922

This supports the current style of errors (M_NOT_FOUND) as well as the errors presented by MSC1797: https://github.com/matrix-org/matrix-doc/pull/1797

src/components/views/dialogs/RetryInvitesDialog.js

@@ -0,0 +1,78 @@
+/*
+Copyright 2019 New Vector Ltd
+
+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 PropTypes from 'prop-types';
+import sdk from '../../../index';
+import { _t } from '../../../languageHandler';
+import {SettingLevel} from "../../../settings/SettingsStore";
+import SettingsStore from "../../../settings/SettingsStore";
+
+export default React.createClass({
+    propTypes: {
+        failedInvites: PropTypes.object.isRequired, // { address: { errcode, errorText } }
+        onTryAgain: PropTypes.func.isRequired,
+        onGiveUp: PropTypes.func.isRequired,
+        onFinished: PropTypes.func.isRequired,
+    },
+
+    _onTryAgainClicked: function() {
+        this.props.onTryAgain();
+        this.props.onFinished(true);
+    },
+
+    _onTryAgainNeverWarnClicked: function() {
+        SettingsStore.setValue("alwaysRetryInvites", null, SettingLevel.ACCOUNT, true);
+        this.props.onTryAgain();
+        this.props.onFinished(true);
+    },
+
+    _onGiveUpClicked: function() {
+        this.props.onGiveUp();
+        this.props.onFinished(false);
+    },
+
+    render: function() {
+        const BaseDialog = sdk.getComponent('views.dialogs.BaseDialog');
+
+        const errorList = Object.keys(this.props.failedInvites)
+            .map(address => <p>{address}: {this.props.failedInvites[address].errorText}</p>);
+
+        return (
+            <BaseDialog className='mx_RetryInvitesDialog'
+                onFinished={this._onGiveUpClicked}
+                title={_t('Failed to invite the following users')}
+                contentId='mx_Dialog_content'
+            >
+                <div id='mx_Dialog_content'>
+                    { errorList }
+                </div>
+
+                <div className="mx_Dialog_buttons">
+                    <button onClick={this._onGiveUpClicked}>
+                        { _t('Close') }
+                    </button>
+                    <button onClick={this._onTryAgainNeverWarnClicked}>
+                        { _t('Try again and never warn me again') }
+                    </button>
+                    <button onClick={this._onTryAgainClicked} autoFocus="true">
+                        { _t('Try again') }
+                    </button>
+                </div>
+            </BaseDialog>
+        );
+    },
+});