fix(lobby): Inconsistent state after deny and then approve. (#15226)

* fix(lobby): Inconsistent state after deny and then approve.

Fixes several issues:
- The error on lobby deny is not sticky
- When preJoin is not enabled we were showing conference UI and showing the error, while the participant is denied to enter the meeting.
- There was inconsistent state (after deny we were keeping membersOnly conference state) and when being approved on re-try while being in the meeting, no remote thumbnails are shown although media is flowing.

The scenario is enabling lobby and tryintg to join, denying the first attempt and approving the second one.

* squash: Drop extra hide lobby screen.

* squash: Finish action first before showing the notification.

react/features/base/conference/reducer.ts

     followMeRecorderEnabled?: boolean;
     joining?: IJitsiConference;
     leaving?: IJitsiConference;
+    lobbyError?: boolean;
     lobbyWaitingForHost?: boolean;
     localSubject?: string;
     locked?: string;
     let membersOnly;
     let passwordRequired;
     let lobbyWaitingForHost;
+    let lobbyError;
 
     switch (error.name) {
     case JitsiConferenceErrors.AUTHENTICATION_REQUIRED:
         authRequired = conference;
         break;
 
+    /**
+     * Access denied while waiting in the lobby.
+     * A conference error when we tried to join into a room with no display name when lobby is enabled in the room.
+     */
     case JitsiConferenceErrors.CONFERENCE_ACCESS_DENIED:
+    case JitsiConferenceErrors.DISPLAY_NAME_REQUIRED: {
+        lobbyError = true;
+
+        break;
+    }
+
     case JitsiConferenceErrors.MEMBERS_ONLY_ERROR: {
         membersOnly = conference;
 
         error,
         joining: undefined,
         leaving: undefined,
+        lobbyError,
         lobbyWaitingForHost,
 
         /**
         membersOnly: undefined,
         leaving: undefined,
 
+        lobbyError: undefined,
         lobbyWaitingForHost: undefined,
 
         /**

react/features/lobby/actions.any.ts

         logger.info(`Lobby starting knocking (membersOnly = ${membersOnly})`);
 
         if (!membersOnly) {
+            // let's hide the notification (the case with denied access and retrying)
+            dispatch(hideNotification(LOBBY_NOTIFICATION_ID));
 
             // no membersOnly, this means we got lobby screen shown as someone
             // tried to join a conference that has lobby enabled without setting display name

react/features/lobby/middleware.ts

 import { INotificationProps } from '../notifications/types';
 import { open as openParticipantsPane } from '../participants-pane/actions';
 import { getParticipantsPaneOpen } from '../participants-pane/functions';
+import { PREJOIN_JOINING_IN_PROGRESS } from '../prejoin/actionTypes';
 import {
     isPrejoinEnabledInConfig,
     isPrejoinPageVisible,
 
         return result;
     }
+    case PREJOIN_JOINING_IN_PROGRESS: {
+        if (action.value) {
+            // let's hide the notification (the case with denied access and retrying) when prejoin is enabled
+            store.dispatch(hideNotification(LOBBY_NOTIFICATION_ID));
+        }
+
+        break;
+    }
     }
 
     return next(action);
 function _conferenceFailed({ dispatch, getState }: IStore, next: Function, action: AnyAction) {
     const { error } = action;
     const state = getState();
-    const { membersOnly } = state['features/base/conference'];
+    const { lobbyError, membersOnly } = state['features/base/conference'];
     const nonFirstFailure = Boolean(membersOnly);
-    const { isDisplayNameRequiredError } = state['features/lobby'];
 
     if (error.name === JitsiConferenceErrors.MEMBERS_ONLY_ERROR) {
         if (typeof error.recoverable === 'undefined') {
 
         // if there was an error about display name and pre-join is not enabled
         if (shouldAutoKnock(state)
-                || (isDisplayNameRequiredError && !isPrejoinEnabledInConfig(state))
+                || (lobbyError && !isPrejoinEnabledInConfig(state))
                 || lobbyWaitingForHost) {
             dispatch(startKnocking());
         }
         return result;
     }
 
-    dispatch(hideLobbyScreen());
+    // if both are available pre-join is with priority (the case when pre-join is enabled)
+    // when pre-join is disabled, and we are in lobby with error, we want to end up in lobby UI
+    // instead of hiding it and showing conference UI. Still in lobby the user can retry
+    // after we show the error notification
+    if (isPrejoinPageVisible(state)) {
+        dispatch(hideLobbyScreen());
+    }
+
+    // we want to finish this action before showing the notification
+    // as the conference will be cleared which will clear all notifications, including this one
+    const result = next(action);
 
     if (error.name === JitsiConferenceErrors.CONFERENCE_ACCESS_DENIED) {
         dispatch(
                 appearance: NOTIFICATION_TYPE.ERROR,
                 hideErrorSupportLink: true,
                 titleKey: 'lobby.joinRejectedTitle',
+                uid: LOBBY_NOTIFICATION_ID,
                 descriptionKey: 'lobby.joinRejectedMessage'
-            }, NOTIFICATION_TIMEOUT_TYPE.LONG)
+            }, NOTIFICATION_TIMEOUT_TYPE.STICKY)
         );
     }
 
-    return next(action);
+    return result;
 }
 
 /**

react/features/lobby/reducer.ts

     case CONFERENCE_LEFT:
         return {
             ...state,
+            isDisplayNameRequiredError: false,
             knocking: false,
             passwordJoinFailed: false
         };