User filter not working with non-latin names

[bogdanovr]

Summary

Mobile app can't find user by typing name in cyrillic.

Environment Information

• Device Name: Honor Magic 5 pro / Apple Iphone 15
• OS Version: Android / IOS
• Mattermost App Version: 2.11.0
• Mattermost Server Version: 9.3.0

Steps to reproduce

Try enter any non-cyrillic user's first or last name characters. Web version works better, but can't find user by case insensitive first or last name.

Expected behavior

Search the user with any corresponding case insensitive input: first name, last name, ldap login-name/email.

Observed behavior (that appears unintentional)

User not found

Possible fixes

[amyblais]

Opened https://mattermost.atlassian.net/browse/MM-56514.

[amyblais]

Closing as a Help Wanted issue was opened for this.