PadMessageHandler: Also send `USER_NEWINFO` messages on reconnect

Now the user list is correct after a reconnect. This also allows
ep_webrtc to automatically recover after a temporary network glitch.

src/node/handler/PadMessageHandler.js

@@ -1121,36 +1121,27 @@ const handleClientReady = async (socket, message, authorID) => {
 
     // Save the current revision in sessioninfos, should be the same as in clientVars
     sessionInfo.rev = pad.getHeadRevisionNumber();
+  }
 
-    // prepare the notification for the other users on the pad, that this user joined
-    const messageToTheOtherUsers = {
+  // Notify other users about this new user.
+  socket.broadcast.to(padIds.padId).json.send({
     type: 'COLLABROOM',
     data: {
       type: 'USER_NEWINFO',
       userInfo: {
         colorId: authorColorId,
+        name: authorName,
         userId: authorID,
       },
     },
-    };
+  });
 
-    // Add the authorname of this new User, if avaiable
-    if (authorName != null) {
-      messageToTheOtherUsers.data.userInfo.name = authorName;
-    }
-
-    // notify all existing users about new user
-    socket.broadcast.to(padIds.padId).json.send(messageToTheOtherUsers);
-
-    // Get sessions for this pad and update them (in parallel)
+  // Notify this new user about other users.
   await Promise.all(_getRoomSockets(pad.id).map(async (roomSocket) => {
-      // Jump over, if this session is the connection session
-      if (roomSocket.id === socket.id) {
-        return;
-      }
+    if (roomSocket.id === socket.id) return;
 
-      // Since sessioninfos might change while being enumerated, check if the
-      // sessionID is still assigned to a valid session
+    // sessioninfos might change while enumerating, so check if the sessionID is still assigned to a
+    // valid session.
     const sessionInfo = sessioninfos[roomSocket.id];
     if (sessionInfo == null) return;
 
@@ -1171,7 +1162,6 @@ const handleClientReady = async (socket, message, authorID) => {
       return;
     }
 
-      // Send the new User a Notification about this other user
     const msg = {
       type: 'COLLABROOM',
       data: {
@@ -1186,7 +1176,6 @@ const handleClientReady = async (socket, message, authorID) => {
 
     socket.json.send(msg);
   }));
-  }
 };
 
 /**