Sharing fails when autocompletion is disabled

Steps to reproduce

1. Create new task
2. Click on "shared button"
3. Type user name

Expected behaviour

Show user with user name which I'm looking for.

Actual behaviour

No user shown.

Server configuration

Operating system: CentOS 7

Web server: Apache

Database: Mariadb

PHP version: 7.3.24

Nextcloud version: 20.0.1

Tasks version: 0.13.5

Updated from an older Nextcloud or fresh install: Updated from an older

Signing status:

No problem

List of activated apps:

If you have access to your command line run e.g.:
sudo -u www-data php occ app:list
from within your Nextcloud installation folder

Nextcloud configuration:

{
    "system": {
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "20.0.1.1",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "mysql.utf8mb4": true,
        "dbtableprefix": "oc_",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "default_language": "cs",
        "default_locale": "cs_CZ",
        "loglevel": 3,
        "ldapIgnoreNamingRules": false,
        "maintenance": false,
        "memcache.local": "\\OC\\Memcache\\APCu",
        "theme": "",
        "trusted_domains": [
            "cloud."
        ],
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpmode": "sendmail",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "lost_password_link": "https:\/\/xxx\/",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trashbin_retention_obligation": "auto",
        "tempdirectory": "\/www\/tmp\/cloud\/",
        "ldapUserCleanupInterval": 3360,
        "ldapProviderFactory": "\\OCA\\User_LDAP\\LDAPProviderFactory",
        "overwrite.cli.url": "https:\/\/cloud",
        "overwritehost": "cloud",
        "mail_smtpauthtype": "LOGIN",
        "simpleSignUpLink.shown": false,
        "app_install_overwrite": [
            "calendar",
            "contacts",
            "gallery",
            "spreed"
        ],
        "app.mail.accounts.default": {
            "email": "%EMAIL%",
            "imapHost": "imap",
            "imapPort": 993,
            "imapUser": "%USERID%",
            "imapSslMode": "ssl",
            "smtpHost": "smtp",
            "smtpPort": 587,
            "smtpUser": "%USERID%",
            "smtpSslMode": "STARTTLS"
        }
    }
}

Are you using external storage, if yes which one: local/smb/sftp/...

Are you using encryption: no

Are you using an external user-backend, if yes which one: LDAP

LDAP configuration (delete this part if not used)

+-------------------------------+--------------------------------------------+
| Configuration                 |                                            |
+-------------------------------+--------------------------------------------+
| hasMemberOfFilterSupport      |                                            |
| homeFolderNamingRule          |                                            |
| lastJpegPhotoLookup           | 0                                          |
| ldapAgentName                 |                                            |
| ldapAgentPassword             | ***                                        |
| ldapAttributesForGroupSearch  |                                            |
| ldapAttributesForUserSearch   |                                            |
| ldapBackupHost                |                                            |
| ldapBackupPort                | 389                                        |
| ldapBase                      | dc=cloud                               |
| ldapBaseGroups                | dc=cloud                               |
| ldapBaseUsers                 | dc=cloud                               |
| ldapCacheTTL                  | 600                                        |
| ldapConfigurationActive       | 1                                          |
| ldapDefaultPPolicyDN          |                                            |
| ldapDynamicGroupMemberURL     |                                            |
| ldapEmailAttribute            | mail                                       |
| ldapExperiencedAdmin          | 0                                          |
| ldapExpertUUIDGroupAttr       | cn                                         |
| ldapExpertUUIDUserAttr        | uid                                        |
| ldapExpertUsernameAttr        |                                            |
| ldapExtStorageHomeAttribute   |                                            |
| ldapGidNumber                 | gidNumber                                  |
| ldapGroupDisplayName          | cn                                         |
| ldapGroupFilter               | (&(objectclass=posixGroup)(cn=xxx))     |
| ldapGroupFilterGroups         | cloudusers                                   |
| ldapGroupFilterMode           | 1                                          |
| ldapGroupFilterObjectclass    | posixGroup                                 |
| ldapGroupMemberAssocAttr      | memberUid                                  |
| ldapHost                      | ldaps://xxxx                        |
| ldapIgnoreNamingRules         |                                            |
| ldapLoginFilter               | (&(|(objectclass=posixAccount))(uid=%uid)) |
| ldapLoginFilterAttributes     |                                            |
| ldapLoginFilterEmail          | 0                                          |
| ldapLoginFilterMode           | 1                                          |
| ldapLoginFilterUsername       | 1                                          |
| ldapMatchingRuleInChainState  | unknown                                    |
| ldapNestedGroups              | 0                                          |
| ldapOverrideMainServer        | 0                                          |
| ldapPagingSize                | 100                                        |
| ldapPort                      | 636                                        |
| ldapQuotaAttribute            | CloudQuota                              |
| ldapQuotaDefault              | 50 GB                                      |
| ldapTLS                       |                                            |
| ldapUserAvatarRule            | default                                    |
| ldapUserDisplayName           | gecos                                      |
| ldapUserDisplayName2          |                                            |
| ldapUserFilter                | (|(objectclass=inetOrgPerson))             |
| ldapUserFilterGroups          |                                            |
| ldapUserFilterMode            | 0                                          |
| ldapUserFilterObjectclass     | inetOrgPerson                              |
| ldapUuidGroupAttribute        | auto                                       |
| ldapUuidUserAttribute         | auto                                       |
| turnOffCertCheck              | 0                                          |
| turnOnPasswordChange          | 0                                          |
| useMemberOfToDetectMembership | 1                                          |
+-------------------------------+--------------------------------------------+

Client configuration

Browser: Vivaldi, Firefox, Chrome

Operating system: Linux

CalDAV-clients:

Logs

Web server error log

cloud. xxx - - [08/Nov/2020:12:46:57 +0100] "GET /ocs/v1.php/apps/files_sharing/api/v1/sharees?format=json&search=xxx&perPage=200&itemType=principals HTTP/2.0" 200 221 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.112 Safari/537.36"

Nextcloud log (data/nextcloud.log)

empty

Browser log

link address:
https://cloud./ocs/v1.php/apps/files_sharing/api/v1/sharees?format=json&search=xxx&perPage=200&itemType=principals

response:
{"ocs":{"meta":{"status":"ok","statuscode":100,"message":"OK","totalitems":"","itemsperpage":""},"data":{"exact":{"users":[{"label":"xxx","value":{"shareType":0,"shareWith":"xxx"},"status":[]}],"groups":[],"remotes":[],"remote_groups":[],"emails":[],"circles":[],"rooms":[],"lookup":[]},"users":[],"groups":[],"remotes":[],"remote_groups":[],"emails":[],"lookup":[],"circles":[],"rooms":[],"lookupEnabled":true}}}

Reproduce the sharing flow from a new task with autocompletion disabled, then inspect the sharees endpoint shown in the report: /ocs/v1.php/apps/files_sharing/api/v1/sharees. Compare its response with the expected user lookup behavior and trace the frontend handling of the returned exact user. Done means typing a username displays the matching user for sharing.