⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

With the new IFilenameValidator implementation I would expect IFolder->newFile() to throw an error if passed file name is invalid. But it seems like that's not the case. newFile() still returns a File object and only further operation on this object fail. I guess there's a bug somewhere.

I discovered this issue while developing nextcloud/text#6271.

Steps to reproduce

1. Call IFolder->newFile() with windows compatibility turned on and an invalid filename as argument
2. See that it returns a File object instead of throwing an exception

Expected behavior

I would expect IFolder->newFile() to throw an error if passed file name is invalid.

Installation method

None

Nextcloud Server version

master

Operating system

None

PHP engine version

None

Web server

None

Database engine version

None

Is this bug present after an update or on a fresh install?

None

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

No response

List of activated Apps

No response

Nextcloud Signing status

No response

Nextcloud Logs

No response

Additional info

No response