[FIX] Pop from room which you have been removed (#1819)

Co-authored-by: Diego Mello <diegolmello@gmail.com>

app/i18n/locales/en.js

@@ -476,6 +476,7 @@ export default {
 	You_can_search_using_RegExp_eg: 'You can use RegExp. e.g. `/^text$/i`',
 	You_colon: 'You: ',
 	you_were_mentioned: 'you were mentioned',
+	You_were_removed_from_channel: 'You were removed from {{channel}}',
 	you: 'you',
 	You: 'You',
 	Logged_out_by_server: 'You\'ve been logged out by the server. Please log in again.',

app/i18n/locales/pt-BR.js

@@ -427,6 +427,7 @@ export default {
 	You_can_search_using_RegExp_eg: 'Você pode usar expressões regulares, por exemplo `/^text$/i`',
 	You_colon: 'Você: ',
 	you_were_mentioned: 'você foi mencionado',
+	You_were_removed_from_channel: 'Você foi removido de {{channel}}',
 	you: 'você',
 	You: 'Você',
 	Your_invite_link_will_expire_after__usesLeft__uses: 'Seu link de convite irá vencer depois de {{usesLeft}} usos.',

app/lib/methods/subscriptions/rooms.js

@@ -13,6 +13,7 @@ import { notificationReceived } from '../../../actions/notification';
 import { handlePayloadUserInteraction } from '../actions';
 import buildMessage from '../helpers/buildMessage';
 import RocketChat from '../../rocketchat';
+import EventEmmiter from '../../../utils/events';
 
 const removeListener = listener => listener.stop();
 
@@ -238,6 +239,7 @@ export default function subscribeRooms() {
 							...threadMessagesToDelete
 						);
 					});
+					EventEmmiter.emit('removed', { rid: data.rid });
 				} catch (e) {
 					log(e);
 				}

app/views/RoomView/index.js

@@ -229,6 +229,7 @@ class RoomView extends React.Component {
 		if (isTablet) {
 			EventEmitter.addEventListener(KEY_COMMAND, this.handleCommands);
 		}
+		EventEmitter.addEventListener('removed', this.handleRemoved);
 		console.timeEnd(`${ this.constructor.name } mount`);
 	}
 
@@ -311,6 +312,7 @@ class RoomView extends React.Component {
 		if (isTablet) {
 			EventEmitter.removeListener(KEY_COMMAND, this.handleCommands);
 		}
+		EventEmitter.removeListener('removed', this.handleRemoved);
 		console.countReset(`${ this.constructor.name }.render calls`);
 	}
 
@@ -551,6 +553,15 @@ class RoomView extends React.Component {
 		EventEmitter.removeListener('connected', this.handleConnected);
 	}
 
+	handleRemoved = ({ rid }) => {
+		const { room } = this.state;
+		const { navigation } = this.props;
+		if (rid === this.rid) {
+			navigation.pop();
+			showErrorAlert(I18n.t('You_were_removed_from_channel', { channel: this.getRoomTitle(room) }), I18n.t('Oops'));
+		}
+	}
+
 	internalSetState = (...args) => {
 		if (!this.mounted) {
 			return;