When "View Outside Room" permission had change to false, the auto complete mention was not displayed on mobile (working on desktop)

Description:

Mention autocomplete which allows the user to see a list of users in the current channel after typing @... does not pop up the users list on mobile devices, it works fine for the same user on desktop app / native web browser. (When "View Outside Room" permission is False.)

Steps to reproduce:

1. Verify your user which does not have "View Outside Room" permission.
2. Join a channel
3. Try to mention other users by typing @ + first letter

Expected behavior:

Will display the autocomplete list for both desktop and mobile.

Actual behavior:

Desktop are working fine:

Mobile are not :

Server Setup Information:

• Version of Rocket.Chat Server: 3.10.0-develop
• Operating System: Ubuntu 16.04
• Deployment Method: tar
• Number of Running Instances: 1
• DB Replicaset Oplog: 0
• NodeJS Version: v12.20.1
• MongoDB Version: 4.2.8

Client Setup Information

• Desktop App or Browser Version: 3.0.3
• Operating System: Window 10 pro , Android , IOS

Reproduce the issue on Android or iOS with a user who lacks “View Outside Room” permission, then trace the mobile mention autocomplete behavior and its permission-filtered user lookup. Done means typing @ followed by a letter displays the autocomplete list on mobile as it does on desktop.