fix(guestName): limit length to 64 characters

[max-nextcloud]

This is the same limit we apply to authenticated user display names.

The text app stores guest names in a 64 char database field.

Note that this is counting characters - not bytes.
So languages with multi-byte characters can still use 64 chars in name.

[susnux]

The text app stores guest names in a 64 char database field.
Note that this is counting characters - not bytes.

Depending on the database used this will not work, it is only guaranteed to store 64 bytes then.

[max-nextcloud]

Depending on the database used this will not work, it is only guaranteed to store 64 bytes then.

Could you point me to the database in question? According to https://docs.oracle.com/en/database/oracle/oracle-database/19/refrn/datatype-limits.html oracle does not seem to be an issue:

CHAR: Maximum size: 2000 bytes

Same for Postgres: https://www.postgresql.org/docs/10/datatype-character.html

Both of these types can store strings up to n characters (not bytes) in length:

I also checked mysql and mariadb. sqlite does not have limited length data types afaik.

[susnux]

Both of these types can store strings up to n characters (not bytes) in length:

But this depends on the encoding used on the database which is not always utf8 (see their mysql variants)

[max-nextcloud]

@susnux adjusted according to your proposal.

[susnux]

/backport to stable6